Document:

exv4w1

 

Exhibit 4.1

 

NUANCE COMMUNICATIONS, INC.

2.75% Senior Convertible Debentures due 2027

INDENTURE

Dated as of August 13, 2007

U.S. Bank National Association

Trustee

      

 

TABLE OF CONTENTS

 

	 	 	 	 	 
	 	 	Page
	ARTICLE
	 	 		 
	Definitions and Incorporation by Reference
	 	 	 	 
	 
	 	 	 	 
	Section 1.01. Definitions
	 	 	1	 
	Section 1.02. Incorporation by Reference of Trust Indenture Act
	 	 	12	 
	Section 1.03. Rules of Construction
	 	 	13	 
	ARTICLE 2 
	 	 	 	 
	The Securities
	 	 	 	 
	 
	 	 	 	 
	Section 2.01. Designation, Amount and Issuance of Securities
	 	 	13	 
	Section 2.02. Form of the Securities
	 	 	13	 
	Section 2.03. Date and Denomination of Securities; Payment at Maturity; Payment of Interest
	 	 	14	 
	Section 2.04. Execution and Authentication
	 	 	16	 
	Section 2.05. Registrar, Paying Agent and Conversion Agent
	 	 	16	 
	Section 2.06. Paying Agent to Hold Money in Trust
	 	 	17	 
	Section 2.07. Securityholder Lists
	 	 	17	 
	Section 2.08. Exchange and Registration of Transfer of Securities
	 	 	17	 
	Section 2.09. Global Securities
	 	 	19	 
	Section 2.10. Transfer Restrictions
	 	 	20	 
	Section 2.11. Responsibilities and Obligations of the Trustee
	 	 	22	 
	Section 2.12. Replacement Securities
	 	 	23	 
	Section 2.13. Outstanding Securities
	 	 	24	 
	Section 2.14. Temporary Securities
	 	 	24	 
	Section 2.15. Cancellation 

	 	 	25	 
	
Section 2.16. CUSIP and ISIN Numbers
	 	 	25	 
	Section 2.17. Additional Securities
	 	 	25	 
	 
	 	 	 	 
	ARTICLE 3
	 	 	 	 
	Redemption and Repurchase of Securities
	 	 	 	 
	 
	 	 	 	 
	Section 3.01. Optional Redemption of Securities
	 	 	26	 
	Section 3.02. Notice of Optional Redemption; Selection of Securities to be Redeemed
	 	 	26	 
	Section 3.03. Payment of Securities Called for Redemption
	 	 	28	 
	Section 3.04. Repurchase at Option of Holders Upon a Fundamental Change
	 	 	29	 

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	 	 	Page
	Section 3.05. Repurchase of Securities by the Company at the Option of Holders
	 	 	31	 
	Section 3.06. Company Repurchase Notice; Tender Offer Compliance
	 	 	32	 
	Section 3.07. Effect of Repurchase Notice; Withdrawal
	 	 	34	 
	Section 3.08. Deposit of Repurchase Price or Fundamental Change Repurchase Price
	 	 	35	 
	Section 3.09. Securities Repurchased in Part
	 	 	35	 
	 
	 	 	 	 
	ARTICLE 4
	 	 	 	 
	Covenants
	 	 	 	 
	 
	 	 	 	 
	Section 4.01. Payment of Securities
	 	 	36	 
	Section 4.02. Maintenance of Office or Agency
	 	 	36	 
	Section 4.03. Rule 144A Information
	 	 	36	 
	Section 4.04. Existence
	 	 	37	 
	Section 4.05. Payment of Taxes and Other Claims
	 	 	37	 
	Section 4.06. Compliance Certificate
	 	 	37	 
	Section 4.07. Additional Interest Notice
	 	 	37	 
	Section 4.08. Exchange Act Reports
	 	 	38	 
	 
	 	 	 	 
	ARTICLE 5
	 	 	 	 
	Successor Company
	 	 	 	 
	 
	 	 	 	 
	Section 5.01. When Company May Merge or Transfer Assets
	 	 	38	 
	Section 5.02. Successor to be Substituted
	 	 	39	 
	Section 5.03. Opinion of Counsel to be Given to Trustee
	 	 	39	 
	 
	 	 	 	 
	ARTICLE 6
	 	 	 	 
	Defaults and Remedies
	 	 	 	 
	 
	 	 	 	 
	Section 6.01. Events of Default
	 	 	40	 
	Section 6.02. Acceleration

	 	 	42	 
	Section 6.03. Other Remedies
	 	 	42	 
	Section 6.04. Waiver of Defaults and Events of Default
	 	 	43	 
	Section 6.05. Control by Majority
	 	 	43	 
	Section 6.06. Limitation on Suits
	 	 	43	 
	Section 6.07. Rights of Securityholders to Receive Payment
	 	 	44	 
	Section 6.08. Collection Suit by Trustee
	 	 	44	 
	Section 6.09. Trustee May File Proofs of Claim
	 	 	44	 
	Section 6.10. Priorities
	 	 	45	 
	Section 6.11. Undertaking for Costs
	 	 	45	 
	Section 6.12. Waiver of Stay, Extension or Usury Laws
	 	 	45	 
	Section 6.13. Alternative Remedy for Failure to Comply with Reporting Obligations in the Indenture and TIA
	 	 	46	 

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	 	 	Page
	 
	 	 	 	 
	ARTICLE 7
	 	 	 	 
	Trustee
	 	 	 	 
	 
	 	 	 	 
	Section 7.01. Duties of Trustee
	 	 	46	 
	Section 7.02. Rights of Trustee
	 	 	48	 
	Section 7.03. Individual Rights of Trustee
	 	 	48	 
	Section 7.04. Trustee’s Disclaimer
	 	 	49	 
	Section 7.05. Notice of Defaults
	 	 	49	 
	Section 7.06. Reports by Trustee to Securityholders
	 	 	49	 
	Section 7.07. Compensation and Indemnity
	 	 	49	 
	Section 7.08. Replacement of Trustee
	 	 	50	 
	Section 7.09. Successor Trustee by Merger
	 	 	51	 
	Section 7.10. Eligibility; Disqualification
	 	 	52	 
	Section 7.11. Preferential Collection of Claims Against Company
	 	 	52	 
	 
	ARTICLE 8
	 	 	 	 
	Discharge of Indenture
	 	 	 	 
	 
	Section 8.01. Discharge of Liability on Securities
	 	 	52	 
	Section 8.02. Application of Trust Money
	 	 	53	 
	Section 8.03. Repayment to Company
	 	 	53	 
	Section 8.04. Reinstatement
	 	 	53	 
	 
	 	 	 	 
	ARTICLE 9
	 	 	 	 
	Amendments
	 	 	 	 
	 
	 	 	 	 
	Section 9.01. Without Consent of Securityholders
	 	 	53	 
	Section 9.02. With Consent of Securityholders
	 	 	55	 
	Section 9.03. Compliance with Trust Indenture Act
	 	 	56	 
	Section 9.04. Revocation and Effect of Consents and Waivers
	 	 	56	 
	Section 9.05. Notation on or Exchange of Securities

	 	 	56	 
	
Section 9.06. Trustee to Sign Amendments
	 	 	57	 
	 
	ARTICLE 10
	 	 	 	 
	Conversion of Securities
	 	 	 	 
	Section 10.01. Right to Convert
	 	 	57	 
	Section 10.02. Exercise of Conversion Right; Issuance of Common Stock on
Conversion; No Adjustment for Interest or Dividends
	 	 	60	 
	Section 10.03. Cash Payments in Lieu of Fractional Shares
	 	 	62	 
	Section 10.04. Conversion Rate
	 	 	62	 
	Section 10.05. Adjustment to Conversion Rate upon a Non-Stock Change of Control
	 	 	62	 
	Section 10.06. Adjustment of Conversion Rate
	 	 	64	 
	Section 10.07. Effect of Reclassification, Consolidation, Merger or Sale
	 	 	74	 

iii

 

	 	 	 	 	 
	 	 	Page
	Section 10.08. Taxes on Shares Issued
	 	 	75	 
	Section 10.09. Reservation of Shares, Shares to be Fully Paid; Compliance with Governmental Requirements; Listing of Common Stock
	 	 	76	 
	Section 10.10. Responsibility of Trustee
	 	 	77	 
	Section 10.11. Notice to Holders Prior to Certain Actions
	 	 	77	 
	Section 10.12. Stockholder Rights Plans
	 	 	78	 
	Section 10.13. Settlement Upon Conversion; Cash Percentage Election
	 	 	79	 
	 
	 	 	 	 
	ARTICLE 11
	 	 	 	 
	Miscellaneous
	 	 	 	 
	 
	 	 	 	 
	Section 11.01. Trust Indenture Act Controls
	 	 	80	 
	Section 11.02. Notices
	 	 	80	 
	Section 11.03. Communication by Securityholders with Other Securityholders

	 	 	80	 
	
Section 11.04. Certificate and Opinion as to Conditions Precedent
	 	 	81	 
	Section 11.05. Statements Required in Certificate or Opinion
	 	 	81	 
	Section 11.06. When Securities Disregarded
	 	 	81	 
	Section 11.07. Rules by Trustee, Paying Agent and Registrar
	 	 	82	 
	Section 11.08. Legal Holidays
	 	 	82	 
	Section 11.09. GOVERNING LAW
	 	 	82	 
	Section 11.10. No Recourse Against Others
	 	 	82	 
	Section 11.11. Successors
	 	 	82	 
	Section 11.12. Multiple Originals
	 	 	82	 
	Section 11.13. Table of Contents; Headings
	 	 	82	 
	Section 11.14. Calculations in Respect of the Securities
	 	 	82	 
	 
	 	 	 	 
	Exhibit A — Form of Security

	 	 	 	 
	Exhibit B — Form of Restrictive Legend for Common Stock Issued Upon Conversion
	 	 	 	 

iv

 

     INDENTURE dated as of August 13, 2007 between NUANCE COMMUNICATIONS, INC., a Delaware
corporation (the “Company”), and U.S. BANK NATIONAL ASSOCIATION, a national banking association, as
trustee (the “Trustee”).

     WHEREAS, the Company has duly authorized the creation of an issue of its 2.75% Senior
Convertible Debentures due 2027 (the “Securities”), having the terms, tenor, amount and other
provisions hereinafter set forth, and, to provide therefor, the Company has duly authorized the
execution and delivery of this Indenture; and

     WHEREAS, all things necessary to make the Securities, when the Securities are duly executed by
the Company and authenticated and delivered hereunder and duly issued by the Company, the valid
obligations of the Company, and to make this Indenture a valid and binding agreement of the
Company, in accordance with their and its terms, have been done and performed, and the execution of
this Indenture and the issue hereunder of the Securities have in all respects been duly authorized,

     NOW, THEREFORE, THIS INDENTURE WITNESSETH:

     For and in consideration of the premises and the purchase of the Securities by the Holders
thereof, it is mutually covenanted and agreed, for the equal and proportionate benefit of all
Holders of the Securities, as follows:

ARTICLE 1

Definitions and Incorporation by Reference

     Section 1.01. Definitions.

     “Additional Interest” means Default Additional Interest and Registration Rights Additional
Interest.

     “Additional Interest Notice” has the meaning specified in Section 4.07.

     “Additional Shares” has the meaning specified in Section 10.05.

     “Additional Securities” has the meaning specified in Section 2.17.

     “Affiliate” of any specified Person means any other Person, directly or indirectly,
controlling or controlled by or under direct or indirect common control with such specified Person.
For the purposes of this definition, “control” when used with respect to any Person means the
power to direct the management and

1

 

policies of such Person, directly or indirectly, whether through
the ownership of
voting securities, by contract or otherwise; and the terms “controlling” and “controlled” have
meanings correlative to the foregoing.

     “Agent Members” has the meaning specified in Section 2.09.

     “Applicable Consideration” has the meaning specified in Section 10.07.

     “Bankruptcy Law” has the meaning specified in Section 6.01.

     “Board of Directors” means the Board of Directors of the Company or, other than in the case of
the definition of “Continuing Directors,” any committee thereof duly authorized to act on behalf of
such Board.

     “Business Day” means each day which is not a Legal Holiday.

     “Capital Stock” of any Person means any and all shares, interests, rights to purchase,
warrants, options, participations or other equivalents of or interests in (however designated)
equity of such Person, including any preferred stock, but excluding any debt securities convertible
into such equity.

     “Cash Percentage” has the meaning specified in Section 10.13(b).

     “Closing Date” means the date of this Indenture.

     “Closing Sale Price” of any share of Common Stock or any other security on any Trading Day
means the closing sale price of such security (or, if no closing sale price is reported, the
average of the closing bid and closing ask prices or, if more than one in either case, the average
of the average closing bid and the average closing ask prices) on such date as reported in
composite transactions for the principal U.S. securities exchange on which the shares of Common
Stock are traded or, if the shares of Common Stock are not listed on a U.S. national or regional
securities exchange, as reported in the over-the-counter market by Pink Sheets LLC or other similar
organization. In the absence of such a quotation, the Closing Sale Price shall be determined by a
nationally recognized securities dealer retained by the Company for that purpose. The Closing Sale
Price shall be determined without reference to extended or after hours trading.

     “Code” means the Internal Revenue Code of 1986, as amended.

     “Common Stock” means any stock of any class of the Company which has no preference in respect
of dividends or of amounts payable in the event of any voluntary or involuntary liquidation,
dissolution or winding up of the Company and which is not subject to redemption by the Company.
Subject to the provisions of Section 10.07, however, shares issuable on conversion of Securities

2

 

shall include only shares of the class designated as common stock of the Company at the date of
this Indenture (namely, the Common Stock, par value $0.001) or shares of any class or classes
resulting from any reclassification or
reclassifications thereof and which have no preference in respect of dividends or of amounts
payable in the event of any voluntary or involuntary liquidation, dissolution or winding up of the
Company and which are not subject to redemption by the Company; provided that if at any time there
shall be more than one such resulting class, the shares of each such class then so issuable on
conversion shall be substantially in the proportion which the total number of shares of such class
resulting from all such reclassifications bears to the total number of shares of all such classes
resulting from all such reclassifications.

     “Company” means the party named as such in this Indenture until a successor replaces it and,
thereafter, means the successor and, for purposes of any provision contained herein and required by
the TIA, each other obligor on the indenture securities.

     “Company Repurchase Notice” has the meaning specified in Section 3.06.

     “Continuing Directors” means, as of any date of determination, any member of the Board of
Directors who (i) was a member of the Board of Directors on the date of this Indenture; or (ii) was
nominated for election or elected to the Board of Directors with the approval of a majority of the
Continuing Directors who were members of the Board of Directors at the time of such new director’s
nomination or election.

     “Conversion Agent” has the meaning specified in Section 2.05.

     “Conversion Date” has the meaning specified in Section 10.02.

     “Conversion Notice” has the meaning specified in Section 10.02.

     “Conversion Observation Period” means, with respect to any Securities, the 20 consecutive
Trading Day period: (1) with respect to a Conversion Date occurring during the period beginning on
the fourth Scheduled Trading Day preceding a Redemption Date and ending on the close of business on
the Business Day prior to the Redemption Date, beginning on the Redemption Date, (2) with respect
to a Conversion Date occurring during the period beginning on the fourth Scheduled Trading Day
preceding the Maturity Date and ending on the close of business on the Business Day immediately
preceding the Maturity Date, beginning on the Maturity Date and (3) in all other cases, beginning
on the third Scheduled Trading Day following the related Conversion Date.

3

 

     “Conversion Price” on any day will equal $1,000 divided by the Conversion Rate in effect on
that day.

     “Conversion Rate” means initially 51.3736 shares of Common Stock per $1,000 principal amount
of Securities, subject to adjustments as set forth herein.

     “Corporate Trust Office” or other similar term, means the designated office of the Trustee at
which at any particular time its corporate trust business as it relates to this Indenture shall be
administered, which office is, at the date as of which this Indenture is dated, located at 225
Asylum Street, Hartford, CT 06103, Attention: Elizabeth C. Hammer, or at any other time at such
other address as the Trustee may designate from time to time by notice to the Company.

     “Current Market Price” on any date means the average of the daily Closing Sale Prices per
share of Common Stock for the ten consecutive Trading Days immediately prior to such date (the “day
in question”); provided that if the Ex-Date for any event (other than the issuance or distribution
requiring such computation) that requires an adjustment to the Conversion Rate pursuant to Section
10.06 occurs during such ten consecutive Trading Days, the Closing Sale Price for each Trading Day
prior to the Ex-Date for such other event shall be adjusted by dividing such Closing Sale Price by
the same fraction by which the Conversion Rate is so required to be multiplied as a result of such
other event. Notwithstanding the foregoing, whenever successive adjustments to the Conversion Rate
are called for pursuant to Section 10.06, such adjustments shall be made to the Current Market
Price as may be necessary or appropriate to effectuate the intent of Section 10.06 and to avoid
unjust or inequitable results as determined in good faith by the Board of Directors.

     “Custodian” has the meaning specified in Section 6.01.

     “Daily Conversion Value” means, for any Trading Day during the Conversion Observation Period,
one-twentieth (1/20) of (1) the applicable Conversion Rate multiplied by (2) the VWAP Price of the
Common Stock (or the consideration into which the Common Stock has been converted in connection
with transactions to which Section 10.07 is applicable) on that day. For the purposes of
determining the Daily Conversion Value the following provisions shall apply: (i) if the Applicable
Consideration includes securities for which the price can be determined in a manner contemplated by
the definition of “VWAP Price,” then the value of such securities shall be determined in accordance
with the principles set forth in such definition; (ii) if the Applicable Consideration includes
other property (other than securities as to which clause (i) applies or cash), then the value of
such property shall be the fair market value of such property as determined by the Board of
Directors in good faith; and (iii) if the

4

 

Applicable Consideration includes cash, then the value of
such cash shall be the amount thereof.

     “Daily Settlement Amount,” for each $1,000 principal amount of Securities, for each of the 20
Trading Days during the Conversion Observation Period, shall consist of:

     (i) cash equal to the lesser of $50 and the Daily Conversion Value; and

     (ii) to the extent the Daily Conversion Value exceeds $50, a number of shares of
Common Stock (the “Daily Share Amount”) equal to, (A) the difference between the Daily
Conversion Value and $50, divided by (B) the VWAP Price of the Common Stock for such day,
appropriately adjusted to reflect stock splits, stock dividends, combinations or similar
events occurring during the Conversion Observation Period, subject to the Company’s right
to deliver a percentage of the Daily Share Amount in cash in accordance with Section
10.13(b).

     “Default” means any event which is, or after notice or passage of time or both would be, an
Event of Default.

     “Default Additional Interest” has the meaning specified in Section 6.13.

     “Depositary” means the clearing agency registered under the Exchange Act that is designated to
act as the depositary for the Global Securities. DTC shall be the initial Depositary, until a
successor shall have been appointed and become such pursuant to the applicable provisions of this
Indenture, and thereafter, “Depositary” shall mean or include such successor.

     “Determination Date” has the meaning specified in Section 10.06(l).

     “Distributed Assets” has the meaning specified in Section 10.06(d).

     “Distribution Notice” has the meaning specified in Section 10.01(c).

     “DTC” means The Depository Trust Company.

     “Effective Date” has the meaning specified in Section 10.05.

     “Event of Default” has the meaning specified in Section 6.01.

     “Ex-Date,” when used with respect to any issuance or distribution, means the first date on
which the shares of Common Stock, trade regular way on the

5

 

relevant exchange or in the relevant
market from which the Closing Sale Price was obtained without the right to receive such issuance or
distribution.

     “Exchange Act” means the Securities Exchange Act of 1934, as amended.

     “Fair Market Value” means the amount which a willing buyer would pay a willing seller in an
arm’s-length transaction.

     “Fiscal Quarter” means, with respect to the Company, a fiscal quarter of the Company. The
Company shall confirm the ending dates of its fiscal quarters for the current fiscal year to the
Trustee upon the Trustee’s request.

     “Fundamental Change” means the occurrence of any of the following after the original issuance
of the Securities:

     (a) the consummation of any transaction (including, without limitation, any merger or
consolidation) the result of which is that any “person” or “group” becomes the “beneficial owner”
(as these terms are defined in Rule 13d-3 and Rule 13d-5 under the Exchange Act), directly or
indirectly, of more than 50% of the Company’s Capital Stock that is at the time entitled to vote by
the holders thereof in the election of the Board of Directors (or comparable body); or

     (b) the first day on which a majority of the members of the Board of Directors are not
Continuing Directors; or

     (c) the adoption of a plan relating to the liquidation or dissolution of the Company; or

     (d) the consolidation or merger of the Company with or into any Person (other than a
subsidiary of the Company), or the sale, lease, transfer, conveyance or other disposition, in one
or a series of related transactions, of all or substantially all of the Company’s assets and those
of its subsidiaries taken as a whole to any “person” (as this term is used in Section 13(d)(3) of
the Exchange Act) (other than to one or more of the Company’s Subsidiaries), other than:

     (i) any transaction:

     (A) that does not result in any reclassification, conversion, exchange or
cancellation of outstanding shares of the Company’s Capital Stock; and

     (B) pursuant to which the holders of 50% or more of the total voting power
of all shares of the Company’s Capital Stock entitled to vote generally in
elections of the Board of Directors immediately prior to such transaction have
the right to exercise,

6

 

directly or indirectly, 50% or more of the total voting
power of all shares of the Capital Stock entitled to vote generally in elections
of the directors of the continuing or surviving Person (or any parent thereof)
immediately after giving effect to such transaction; or

     (ii) any merger primarily for the purpose of changing the Company’s jurisdiction of
incorporation and resulting in a reclassification, conversion or exchange of outstanding
shares of Common Stock solely into shares of common stock of the surviving entity; or

     (e) the termination of trading of the Common Stock, which will be deemed to have occurred if
the Common Stock or other common stock into which
the Securities are convertible is not listed for trading on a U.S. national securities
exchange.

     However, a Fundamental Change will be deemed not to have occurred if at least 90% of the
consideration in the transaction or transactions (other than cash payments for fractional shares
and cash payments made in respect of dissenters’ appraisal rights) which otherwise would constitute
a Fundamental Change under clauses (a) or (d) above consists of shares of common stock traded or to
be traded immediately following such transaction on a U.S. national securities exchange and, as a
result of the transaction or transactions, the Securities become convertible solely into such
common stock and other consideration, subject to the provisions set forth in Section 10.07.

     “Fundamental Change Repurchase Date” has the meaning specified in Section 3.04(a).

     “Fundamental Change Repurchase Notice” has the meaning specified in Section 3.04(c).

     “Fundamental Change Repurchase Price” has the meaning specified in Section 3.04(a).

     “GAAP” means generally accepted accounting principles in the United States of America as in
effect on the Closing Date, including those set forth in (i) the opinions and pronouncements of the
Accounting Principles Board of the American Institute of Certified Public Accountants, (ii)
statements and pronouncements of the Financial Accounting Standards Board, (iii) such other
statements by such other entity as approved by a significant segment of the accounting profession,
and (iv) the rules and regulations of the SEC governing the inclusion of financial statements
(including pro forma financial statements) in periodic reports required to be filed pursuant to
Section 13 of the Exchange Act,

7

 

including opinions and pronouncements in staff accounting bulletins
and similar written statements from the accounting staff of the SEC.

     “Global Securities” has the meaning specified in Section 2.02.

     “Indebtedness” means, with respect to any Person all indebtedness of such Person for borrowed
money.

     “Indenture” means this Indenture as amended or supplemented from time to time.

     “Initial Purchasers” means each of Citigroup Global Markets Inc. and Goldman, Sachs & Co.
(each, an “Initial Purchaser”).

     “interest” means, when used with reference to the Securities, any interest payable under the
terms of the Securities, including defaulted interest, if any, Additional Interest, if any, payable
under the terms of the Registration Rights Agreement and additional interest, if any, payable
pursuant to Section 6.13.

     “Interest Record Dates” means the dates specified as such in the form of Security set forth as
Exhibit A hereto. The Interest Record Date for any interest payment date for the Securities shall
be the Interest Record Date immediately preceding the applicable interest payment date.

     “Legal Holiday” has the meaning specified in Section 11.08.

     “Market Disruption Event” means the occurrence or existence during the one-half hour period
ending on the scheduled close of trading on any Trading Day for the Common Stock of any material
suspension or limitation imposed on trading (by reason of movements in price exceeding limits
permitted by The Nasdaq Global Select Market or otherwise) in the Common Stock or in any options,
contracts or future contracts relating to the Common Stock.

     “Maturity Date” means August 15, 2027.

     “Non-Stock Change of Control” means a transaction described under clause (a), clause (d) or
clause (e) in the definition of Fundamental Change and in case of clause (a) or clause (d), other
than pursuant to any transaction which otherwise would constitute a Fundamental Change under clause
(a) or (d) of the definition of Fundamental Change in which at least 90% of the consideration for
the Common Stock (other than cash payments for fractional shares and cash payments made in respect
of dissenters’ appraisal rights) consists of shares of common stock traded or to be traded
immediately following such transaction on a U.S. national securities exchange and, as a result of
such transaction of transactions, the Securities become convertible into such common stock.

8

 

     “Notice of Default” shall have the meaning specified in Section 6.01.

     “Officer” means the Chairman of the Board, the Chief Executive Officer, the Chief Financial
Officer, the President, any Vice President, the Treasurer, any Assistant Treasurer, the Secretary
or any Assistant Secretary of the Company.

     “Officers’ Certificate” means a certificate signed by two Officers.

     “Opinion of Counsel” means a written opinion from legal counsel who is acceptable to the
Trustee. The counsel may be an employee of or counsel to the Company or the Trustee.

     “Paying Agent” has the meaning specified in Section 2.05.

     “Person” means any individual, corporation, partnership, limited liability company, joint
venture, association, joint-stock company, trust, unincorporated organization, government or any
agency or political subdivision thereof or any other entity.

     “PORTAL Market” means The PORTAL Market operated by the Nasdaq Stock Market or any successor
thereto.

     “preferred stock,” as applied to the Capital Stock of any Person, means Capital Stock of any
class or classes (however designated) that is preferred as to the payment of dividends, or as to
the distribution of assets upon any voluntary or involuntary liquidation or dissolution of such
Person, over shares of Capital Stock of any other class of such Person.

     “Principal” of a Security means the principal of the Security plus the premium, if any,
payable on the Security that is due or overdue or is to become due at the relevant time.

     “protected purchaser” has the meaning specified in Section 2.12.

     “Purchase Agreement” means the Purchase Agreement dated August 7, 2007, among the Company and
the Initial Purchasers relating to the offering and sale of the Securities.

     “Purchased Shares” has the meaning specified in Section 10.06(f).

     “Redemption Date” has the meaning specified in Section 3.01.

     “Redemption Price” has the meaning specified in Section 3.01.

     “Reference Period” has the meaning specified in Section 10.06(d).

9

 

     “Register” has the meaning specified in Section 2.05.

     “Registrar” has the meaning specified in Section 2.05.

     “Registration Rights Additional Interest” has the meaning specified for Additional Interest in
Section 6(a) of the Registration Rights Agreement.

     “Registration Rights Agreement” means the Registration Rights Agreement dated as of August 13,
2007 among the Company and the Initial Purchasers, as amended from time to time in accordance with
its terms.

     “Repurchase Date” has the meaning specified in Section 3.05(a).

     “Repurchase Notice” has the meaning specified in Section 3.05(c).

     “Repurchase Price” has the meaning specified in Section 3.05(a).

     “Restricted Securities” has the meaning specified in Section 2.10.

     “Restricted Security Legend” has the meaning specified in Section 2.10.

     “Rule 144A” means Rule 144A as promulgated under the Securities Act as it may be amended from
time to time hereafter.

     “Scheduled Trading Day” means a day that is scheduled to be a Trading Day on the primary U.S.
national or regional securities exchange or market on which the Common Stock is listed or, if the
Common Stock is not listed on a U.S. national or regional securities exchange, on the principal
other market on which the Common Stock is then traded.

     “SEC” means the Securities and Exchange Commission.

     “Securities” means any security issued, authenticated and delivered under this Indenture,
including any Global Securities.

     “Securities Act” means the Securities Act of 1933, as amended, and the rules and regulations
promulgated thereunder, as in effect from time to time.

     “Securityholder” or “Holder” means the Person in whose name a Security is registered on the
Registrar’s books.

     “Significant Subsidiary” means any Subsidiary of a Person that would be a “Significant
Subsidiary” of the Person within the meaning of Rule 1-02 under Regulation S-X promulgated by the
SEC.

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     “Spin-Off” has the meaning specified in Section 10.06(d).

     “Stock Price” has the meaning specified in Section 10.05.

     “Subsidiary” of any Person means any corporation, association, partnership or other business
entity of which more than 50% of the total voting power of shares of Capital Stock or other
interests (including partnership interests) entitled (without regard to the occurrence of any
contingency) to vote in the election of directors, managers or trustees thereof is at the time
owned or controlled, directly or indirectly, by (i) such Person, (ii) such Person and one or more
Subsidiaries of such Person or (iii) one or more Subsidiaries of such Person.

     “TIA” or “Trust Indenture Act” means the Trust Indenture Act of 1939 (15 U.S.C. §§
77aaa-77bbbb), as amended, as in effect on the date of this Indenture.

     “Trading Day” means a day during which (i) trading in the Common Stock generally occurs, (ii)
there is no Market Disruption Event and (iii) a Closing Sale Price for the Common Stock is provided
on the principal U.S. national or regional securities exchange on which the Common Stock is then
listed or, if the Common Stock is not listed on a U.S. national or regional securities exchange, on
the principal other market on which the Common Stock is then traded. If the Common Stock (or other
security for which a Closing Sale Price must be determined) is not listed or traded, “Trading Day”
means a “Business Day.”

     “Trading Price” means, with respect to a Security on any date of determination, the average of
the secondary market bid quotations per $1,000 principal amount of the Securities obtained by the
Trustee at the direction of the Company for $5,000,000 principal amount of the Securities at
approximately 3:30 p.m., New York City time, on such determination date from two independent
nationally recognized securities dealers selected by the Company, which may include one or more of
the Initial Purchasers; provided that if at least two such bids cannot reasonably be obtained by
the Trustee, but one such bid can be reasonably obtained by the Trustee, this one bid will be used.
If the Trustee cannot reasonably obtain at least one bid for $5,000,000 principal amount of the
Securities from a nationally recognized securities dealer or in the Company’s reasonable judgment,
the bid quotations are not indicative of the secondary market value of the Securities, then, for
purposes of Section 10.01(a)(viii), the Trading Price of $1,000 principal amount of the Securities
will be deemed to be less than 98% of the applicable Conversion Rate of the Securities multiplied
by the Closing Sale Price of Common Stock on such determination date.

     “Trigger Event” has the meaning specified in Section 10.06(d).

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     “Trust Officer” means the Chairman of the Board, the President or any other officer or
assistant officer of the Trustee assigned by the Trustee to administer its corporate trust matters.

     “Trustee” means the party named as such in this Indenture until a successor replaces it and,
thereafter, means the successor.

     “Uniform Commercial Code” means the New York Uniform Commercial Code as in effect from time to
time.

     “VWAP Price” per share of the Common Stock on any Trading Day means such price as displayed on
Bloomberg (or any successor service) page NUAN <Equity> VWAP in respect of the period from
9:30 a.m. to 4:00 p.m., New York City time, on such Trading Day; or, if such price is not
available, the “VWAP Price” means the market value per share of the Common Stock on such day on a
volume weighted basis, if possible, as determined by a nationally recognized investment banking
firm retained for this purpose by the Company.

     “Wholly Owned Subsidiary” of any Person means a Subsidiary of such Person, all the Capital
Stock of which (other than directors’ qualifying shares) is owned by such Person or another Wholly
Owned Subsidiary of such Person.

     Section 1.02. Incorporation by Reference of Trust Indenture Act. This Indenture is subject
to the mandatory provisions of the TIA, which are incorporated by reference in and made a part of
this Indenture. The following TIA terms have the following meanings:

     “Commission” means the SEC.

     “indenture securities” means the Securities.

     “indenture security holder” means a Securityholder.

     “indenture to be qualified” means this Indenture.

     “indenture trustee” or “institutional trustee” means the Trustee.

     “obligor” on the indenture securities means the Company and any other obligor on the indenture
securities.

     All other TIA terms used in this Indenture that are defined by the TIA, defined by TIA
reference to another statute or defined by SEC rule have the meanings assigned to them by such
definitions.

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     Section 1.03. Rules of Construction. Unless the context otherwise requires:

     (1) a term has the meaning assigned to it;

     (2) an accounting term not otherwise defined has the meaning assigned to it in accordance with
GAAP;

     (3) “or” is not exclusive;

     (4) “including” means including without limitation; and

     (5) words in the singular include the plural and words in the plural include the singular.

ARTICLE 2

The Securities

     Section 2.01. Designation, Amount and Issuance of Securities. The Securities shall be
designated as “2.75% Senior Convertible Debentures due

2027.” The Securities will initially be issued in the aggregate principal amount of
$250,000,000. The Company may issue additional securities in accordance with Section 2.17. Upon
the execution of this Indenture, or from time to time thereafter, Securities may be executed by the
Company and delivered to the Trustee for authentication, and the Trustee shall thereupon
authenticate and deliver Securities upon a written order of the Company, such order signed by an
Officer of the Company, without any further action by the Company hereunder.

     Section 2.02. Form of the Securities. The Securities and the Trustee’s certificate of
authentication to be borne by such Securities shall be substantially in the form set forth in
Exhibit A hereto. The terms and provisions contained in the form of Securities attached as Exhibit
A hereto shall constitute, and are hereby expressly made, a part of this Indenture and, to the
extent applicable, the Company and the Trustee, by their execution and delivery of this Indenture,
expressly agree to such terms and provisions and to be bound thereby.

     Any of the Securities may have such letters, numbers or other marks of identification and such
notations, legends, endorsements or changes as the officers executing the same may approve
(execution thereof to be conclusive evidence of such approval) and as are not inconsistent with the
provisions of this Indenture, or as may be required by the custodian for the Global Securities, the
Depositary or by the National Association of Securities Dealers, Inc. in order for the Securities
to be tradable on The PORTAL Market or as may be required for the Securities to

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be tradable on any
other market developed for trading of securities pursuant to Rule 144A or as may be required to
comply with any applicable law or with any rule or regulation made pursuant thereto or with any
rule or regulation of any securities exchange or automated quotation system on which the Securities
may be listed, or to conform to usage, or to indicate any special limitations or restrictions to
which any particular Securities are subject.

     So long as the Securities are eligible for book-entry settlement with the Depositary, or
unless otherwise required by law, subject to Section 2.09, all of the Securities will be
represented by one or more Securities in global form registered in the name of the Depositary or
the nominee of the Depositary (“Global Securities”). The transfer and exchange of beneficial
interests in any such Global Securities shall be effected through the Depositary in accordance with
this Indenture and the applicable procedures of the Depositary. Except as provided in Section
2.09, beneficial owners of a Global Security shall not be entitled to have certificates registered
in their names, will not receive or be entitled to receive physical delivery of certificates in
definitive form and will not be considered Holders of such Global Security.

     Any Global Securities shall represent such of the outstanding Securities as shall be specified
therein and shall provide that it shall represent the aggregate amount of outstanding Securities
from time to time endorsed thereon and that the aggregate amount of outstanding Securities
represented thereby may from time to
time be increased or reduced to reflect issuances, redemptions, repurchases, conversions,
transfers or exchanges permitted hereby. Any endorsement of a Global Security to reflect the
amount of any increase or decrease in the amount of outstanding Securities represented thereby
shall be made by the Trustee or the custodian for the Global Security, at the direction of the
Trustee, in such manner and upon instructions given by the Holder of such Securities in accordance
with this Indenture. Payment of principal of, and interest on, any Global Securities shall be made
to the Depositary in immediately available funds.

     Section 2.03. Date and Denomination of Securities; Payment at Maturity; Payment of Interest.
The Securities shall be issuable in registered form without coupons in denominations of $1,000
principal amount and integral multiples thereof. Each Security shall be dated the date of its
authentication and shall bear interest from the date specified on the face of the form of
Securities attached as Exhibit A hereto. Interest on the Securities shall be computed on the basis
of a 360-day year comprised of twelve 30-day months.

     On the Maturity Date, each Holder shall be entitled to receive on such date the principal
amount of the Securities held and accrued and unpaid interest to, but not including, the Maturity
Date. With respect to Global Securities, principal and interest will be paid to the Depositary in
immediately available funds. With

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respect to any certificated Securities, principal and interest
will be payable at the Company’s office or agency maintained for that purpose, which initially will
be the Trustee’s office at 100 Wall Street, Suite 1600, New York, NY 10005.

     The Person in whose name any Security is registered on the Register at 5:00 p.m., New York
City time, on any Interest Record Date with respect to any interest payment date shall be entitled
to receive the interest payable on such interest payment date, except that the interest payable
upon maturity will be payable to the Person to whom principal is payable upon maturity.

     Notwithstanding the foregoing, any Securities or portion thereof surrendered for conversion
during the period after the Interest Record Date for any interest payment date and ending prior to
the corresponding interest payment date shall be accompanied by payment, in immediately available
funds or other funds acceptable to the Company, of an amount equal to the interest (excluding any
Additional Interest) otherwise payable on such interest payment date on the principal amount being
converted; provided that no such payment need be made (1) if a Holder converts its Securities in
connection with a redemption and the Company has specified a Redemption Date that is after an
Interest Record Date and on or prior to the corresponding interest payment date, (2) if a Holder
converts its Securities in connection with a Fundamental Change and the Company has specified a
Fundamental Change Repurchase Date that is after an Interest Record Date and on or prior to the
corresponding interest payment date or (3) to the extent of any overdue interest, if overdue
interest exists at the time of conversion with respect to such Securities.

     Except as provided above, the Company shall pay interest (i) on any Global Securities by wire
transfer of immediately available funds to the account of the Depositary or its nominee, (ii) on
any Securities in certificated form having a principal amount of less than $2,000,000, by check
mailed to the address of the Person entitled thereto as it appears in the Register, provided that
at maturity, interest will be payable at the office of the Company maintained by the Company for
such purposes, which shall initially be an office or agency of the Trustee located at 100 Wall
Street, Suite 1600, New York, NY 10005 and (iii) on any Securities in certificated form having a
principal amount of $2,000,000 or more, by wire transfer in immediately available funds at the
election of the Holder of such Securities who has duly delivered notice of such election and
applicable wire instructions to the Trustee at least five Business Days prior to the relevant
interest payment date, provided that at maturity, interest will be payable at the office of the
Company maintained by the Company for such purposes, which shall initially be an office or agency
of the Trustee located at 100 Wall Street, Suite 1600, New York, NY 10005. If a payment date is
not a Business Day, payment shall be made on the next succeeding Business Day, and no additional
interest shall accrue thereon.

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     Section 2.04. Execution and Authentication. One or more Officers shall sign the Securities
for the Company by manual or facsimile signature.

     If an Officer whose signature is on a Security no longer holds that office at the time the
Trustee authenticates the Security, the Security shall be valid nevertheless.

     A Security shall not be valid until an authorized signatory of the Trustee manually signs the
certificate of authentication on the Security. The signature shall be conclusive evidence that the
Security has been authenticated under this Indenture.

     The Trustee may appoint an authenticating agent reasonably acceptable to the Company to
authenticate the Securities. Any such appointment shall be evidenced by an instrument signed by a
Trust Officer, a copy of which shall be furnished to the Company. Unless limited by the terms of
such appointment, an authenticating agent may authenticate Securities whenever the Trustee may do
so. Each reference in this Indenture to authentication by the Trustee includes authentication by
such agent. An authenticating agent has the same rights as any Registrar, Paying Agent or agent
for service of notices and demands.

     Section 2.05. Registrar, Paying Agent and Conversion Agent. The Company shall maintain an
office or agency where Securities may be presented for registration of transfer or for exchange
(the “Registrar”), an office or agency where Securities may be presented for payment (the “Paying
Agent”) and an office or agency where Securities may be presented for conversion (the “Conversion
Agent”). The Corporate Trust Office shall be considered as one
such office or agency of the Company for each of the aforesaid purposes. The Registrar shall
keep a register of the Securities (the “Register”) and of their transfer and exchange. The Company
may have one or more co-registrars and one or more additional paying agents. The term “Paying
Agent” includes any additional paying agent, and the term “Registrar” includes any co-registrars.
The Company initially appoints the Trustee as (i) Registrar and Paying Agent in connection with the
Securities, (ii) the custodian with respect to the Global Securities and (iii) Conversion Agent.

     The Company shall enter into an appropriate agency agreement with any Registrar, Paying Agent
or Conversion Agent not a party to this Indenture, which shall incorporate the terms of the TIA.
The agreement shall implement the provisions of this Indenture that relate to such agent. The
Company shall notify the Trustee of the name and address of any such agent. If the Company fails
to maintain a Registrar, Paying Agent or Conversion Agent, the Trustee shall act as such and shall
be entitled to appropriate compensation therefor pursuant to

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Section 7.07. The Company or any of
its domestically organized Wholly Owned Subsidiaries may act as Paying Agent, Conversion Agent or
Registrar.

     The Company may remove any Registrar, Paying Agent or Conversion Agent upon written notice to
such Registrar, Paying Agent or Conversion Agent and to the Trustee; provided that no such removal
shall become effective until (1) acceptance of an appointment by a successor as evidenced by an
appropriate agreement entered into by the Company and such successor Registrar, Paying Agent or
Conversion Agent, as the case may be, and delivered to the Trustee or (2) notification to the
Trustee that the Trustee shall serve as Registrar, Paying Agent or Conversion Agent until the
appointment of a successor in accordance with clause (1) above. The Registrar, Paying Agent or
Conversion Agent may resign at any time upon written notice; provided that the Trustee may resign
as Paying Agent, Conversion Agent or Registrar only if the Trustee also resigns as Trustee in
accordance with Section 7.08.

     Section 2.06. Paying Agent to Hold Money in Trust. On or prior to each due date of the
principal and interest on any Security, the Company shall deposit with the Paying Agent (or if the
Company or a Wholly Owned Subsidiary of the Company is acting as Paying Agent, segregate and hold
in trust for the benefit of the Persons entitled thereto) a sum sufficient to pay such principal
and interest when so becoming due. The Company shall require each Paying Agent (other than the
Trustee) to agree in writing that the Paying Agent shall hold in trust for the benefit of
Securityholders or the Trustee all money held by the Paying Agent for the payment of principal of
or interest on the Securities and shall notify the Trustee of any default by the Company in making
any such payment. If the Company or a Wholly Owned Subsidiary of the Company acts as Paying Agent,
it shall segregate the money held by it as Paying Agent and hold it as a separate trust fund. The
Company at any time may require a Paying Agent to pay all money held by it to the Trustee and to
account for any funds disbursed by the
Paying Agent. Upon complying with this Section, the Paying Agent shall have no further
liability for the money delivered to the Trustee.

     Section 2.07. Securityholder Lists. The Trustee shall preserve in as current a form as is
reasonably practicable the most recent list available to it of the names and addresses of
Securityholders. If the Trustee is not the Registrar, the Company shall furnish, or cause the
Registrar to furnish, to the Trustee, in writing at least five Business Days before each interest
payment date and at such other times as the Trustee may request in writing, a list in such form and
as of such date as the Trustee may reasonably require of the names and addresses of
Securityholders.

     Section 2.08. Exchange and Registration of Transfer of Securities. The Company shall cause
to be kept at the Corporate Trust Office the Register in

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which, subject to such reasonable
regulations as it may prescribe, the Company shall provide for the registration of Securities and
of transfers of Securities. The Register shall be in written form or in any form capable of being
converted into written form within a reasonably prompt period of time.

     Upon surrender for registration of transfer of any Securities to the Registrar or any
co-registrar, and satisfaction of the requirements for such transfer set forth in this Section 2.08
and in Section 2.10, the Company shall execute, and the Trustee shall authenticate and deliver, in
the name of the designated transferee or transferees, one or more new Securities of any authorized
denominations and of a like aggregate principal amount and bearing such restrictive legends as may
be required by this Indenture.

     Securities may be exchanged for other Securities of any authorized denominations and of a like
aggregate principal amount and bearing such restrictive legends as may be required by this
Indenture, upon surrender of the Securities to be exchanged at any such office or agency maintained
by the Company pursuant to Section 4.02. Whenever any Securities are so surrendered for exchange,
the Company shall execute, and the Trustee shall authenticate and deliver, the Securities that the
Holder making the exchange is entitled to receive bearing registration numbers not
contemporaneously outstanding.

     All Securities issued upon any registration of transfer or exchange of Securities shall be the
valid obligations of the Company, evidencing the same debt, and entitled to the same benefits under
this Indenture, as the Securities surrendered upon such registration of transfer or exchange.

     All Securities presented or surrendered for registration of transfer or for exchange,
redemption, repurchase or conversion shall (if so required by the Company or the Registrar) be duly
endorsed, or be accompanied by a written instrument or instruments of transfer in form satisfactory
to the Company, duly executed by the Holder thereof or his attorney duly authorized in writing.

     No service charge shall be made to any Holder for any registration of, transfer or exchange of
Securities, but the Company may require payment by the Holder of a sum sufficient to cover any tax,
assessment or other governmental charge that may be imposed in connection with any registration of
transfer or exchange of Securities.

     Neither the Company nor the Trustee nor any Registrar shall be required to exchange, issue or
register a transfer of (a) any Securities for a period of fifteen calendar days next preceding date
of mailing of a notice of redemption, (b) any Securities or portions thereof called for redemption
pursuant to Section 3.02, except for the unredeemed portion of any Securities being redeemed in
part, (c)

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any Securities or portions thereof surrendered for conversion pursuant to Article 10, (d)
any Securities or portions thereof tendered for repurchase (and not withdrawn) pursuant to Section
3.04 or (e) any Securities or portions thereof tendered for repurchase (and not withdrawn) pursuant
to Section 3.05.

     Section 2.09. Global Securities. The following provisions shall apply to Global Securities:

     (a) Each Global Security authenticated under this Indenture shall be registered in the name of
the Depositary or a nominee thereof and delivered to the Depositary or a nominee thereof or
custodian for the Global Securities therefor, and each such Global Security shall constitute a
single Security for all purposes of this Indenture.

     (b) Notwithstanding any other provision in this Indenture, no Global Security may be exchanged
in whole or in part for Securities registered, and no transfer of a Global Security in whole or in
part may be registered, in the name of any Person other than the Depositary or a nominee thereof
unless (A) the Depositary (x) has notified the Company that it is unwilling or unable to continue
as Depositary for such Global Security or (y) has ceased to be a clearing agency registered under
the Exchange Act, and a successor depositary has not been appointed by the Company within 90
calendar days, or (B) the Company, in its sole discretion, notifies the Trustee in writing that it
no longer wishes to have all the Securities represented by Global Securities. Any Global
Securities exchanged pursuant to this Section 2.09(b) shall be so exchanged in whole and not in
part.

     (c) In addition, certificated Securities will be issued in exchange for beneficial interests
in a Global Security upon request by or on behalf of the Depositary in accordance with customary
procedures following the request of a beneficial owner seeking to enforce its rights under the
Securities or this Indenture upon the occurrence and during the continuance of an Event of Default.

     (d) Securities issued in exchange for a Global Security or any portion thereof pursuant to
Section 2.09(b) or Section 2.09(c) shall be issued in definitive, fully registered form, without
interest coupons, shall have an aggregate principal
amount equal to that of such Global Securities or portion thereof to be so exchanged, shall be
registered in such names and be in such authorized denominations as the Depositary shall designate
and shall bear any legends required hereunder. Any Global Securities to be exchanged shall be
surrendered by the Depositary to the Trustee, as Registrar, provided that pending completion of the
exchange of a Global Security, the Trustee acting as custodian for the Global Securities for the
Depositary or its nominee with respect to such Global Securities, shall reduce the principal amount
thereof, by an amount equal to the portion thereof to be so exchanged, by means of an appropriate
adjustment made

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on the records of the Trustee. Upon any such surrender or adjustment, the Trustee
shall authenticate and make available for delivery the Securities issuable on such exchange to or
upon the written order of the Depositary or an authorized representative thereof.

     (e) In the event of the occurrence of any of the events specified in Section 2.09(b) above or
upon any request described in Section 2.09(c), the Company will promptly make available to the
Trustee a sufficient supply of certificated Securities in definitive, fully registered form,
without interest coupons.

     (f) Neither any members of, or participants in, the Depositary (“Agent Members”) nor any other
Persons on whose behalf Agent Members may act shall have any rights under this Indenture with
respect to any Global Securities registered in the name of the Depositary or any nominee thereof,
and the Depositary or such nominee, as the case may be, may be treated by the Company, the Trustee
and any agent of the Company or the Trustee as the absolute owner and Holder of such Global
Securities for all purposes whatsoever. Notwithstanding the foregoing, nothing herein shall
prevent the Company, the Trustee or any agent of the Company or the Trustee from giving effect to
any written certification, proxy or other authorization furnished by the Depositary or such
nominee, as the case may be, or impair, as between the Depositary, its Agent Members and any other
Person on whose behalf an Agent Member may act, the operation of customary practices of such
Persons governing the exercise of the rights of a Holder of any Securities.

     (g) At such time as all interests in a Global Security have been redeemed, repurchased,
converted, cancelled or exchanged for Securities in certificated form, such Global Security shall,
upon receipt thereof, be canceled by the Trustee in accordance with standing procedures and
instructions existing between the Depositary and the custodian for the Global Security. At any
time prior to such cancellation, if any interest in a Global Security is redeemed, repurchased,
converted, cancelled or exchanged for Securities in certificated form, the principal amount of such
Global Security shall, in accordance with the standing procedures and instructions existing between
the Depositary and the custodian for the Global Security, be appropriately reduced, and an
endorsement shall be made on such Global Security, by the Trustee or the custodian for the Global
Security, at the direction of the Trustee, to reflect such reduction.

     Section 2.10. Transfer Restrictions. Until the expiration of the holding period applicable
to sales of Securities under Rule 144(k) under the Securities Act (or any successor provision), (1)
any certificate evidencing a Security shall bear a legend in substantially the form identified as
the “Restricted Security Legend” (the “Restricted Security Legend”) in the form of Security set
forth in Exhibit A and (2) any certificate representing Common Stock issued upon conversion of the

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Securities shall bear a legend in substantially the form of Exhibit B, unless such Security (or
such Common Stock) has been sold pursuant to a registration statement that has been declared
effective under the Securities Act (and which continues to be effective at the time of such
transfer) or sold pursuant to Rule 144 under the Securities Act or any similar provision then in
force, or unless otherwise agreed by the Company in writing, with written notice thereof to the
Trustee.

     Every Security (and all securities issued in exchange therefor or in substitution thereof)
that bears or is required under this Section 2.10 to bear the legend required by this Section 2.10
(together with any Common Stock issued upon conversion of the Securities and required to bear the
legend set forth in Exhibit B, collectively, the “Restricted Securities”) shall be subject to the
restrictions on transfer set forth in this Section 2.10 and such legends, unless such restrictions
on transfer shall be waived by written consent of the Company following receipt of legal advice
supporting the permissibility of the waiver of such transfer restrictions, and the Holder of any
Restricted Securities, by such Holder’s acceptance thereof, agrees to be bound by all such
restrictions on transfer. As used in this Section 2.10, the term “transfer” means any sale,
pledge, loan, transfer or other disposition whatsoever of any Restricted Security or any interest
therein.

     In connection with any transfer of the Securities that are Restricted Securities prior to the
date two years after the last date of original issuance of the Securities (other than a transfer
pursuant to a registration statement which has been declared effective under the Securities Act),
the Holder must complete and deliver the form of assignment set forth on the certificate
representing the Securities with the appropriate box checked to the Trustee (or any successor
Trustee, as applicable). If the proposed transfer is pursuant to clause (D) of the Restricted
Security Legend, the Holder must, prior to such transfer, furnish to the Trustee (or any successor
Trustee, as applicable), such certifications, legal opinions or other information as the Company
may reasonably require to confirm that such transfer is being made pursuant to an exemption from,
or in a transaction not subject to, the registration requirements of the Securities Act. The
Restricted Security Legend will be removed upon the earlier of the transfer of the Security
evidenced thereby pursuant to clause (B) of the Restricted Security Legend or the expiration of two
years from the last date of original issuance of the Securities.

     If Rule 144(k) as promulgated under the Securities Act is amended to change the two-year
period under Rule 144(k), then, the references in the Restricted Security Legend and in Exhibit B
to “two years,” and in the
corresponding transfer restrictions described above, will refer to such changed period. If
Rule 144(k) is amended so that a longer holding period applies in circumstances where a holder of
the Securities or Common Stock issuable upon conversion of the Securities has engaged in hedging
activities, the longer holding

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period shall be the changed holding period. As soon as practicable
after the Company has knowledge of the effectiveness of any such amendment to change the two-year
period under Rule 144(k), unless such changes would otherwise be prohibited by, or would otherwise
cause a violation of, the federal securities laws applicable at the time, the Company will provide
to the Trustee certain certificates and opinions as to the effectiveness of such amendment and the
effectiveness of such change to the restrictive legends and transfer restrictions applicable to the
Securities.

     Any Securities that are Restricted Securities and as to which such restrictions on transfer
shall have expired in accordance with their terms or as to conditions for removal of the Restricted
Security Legend set forth therein have been satisfied may, upon surrender of such Securities for
exchange to the Registrar in accordance with the provisions of this Section 2.10, be exchanged for
a new Security or Securities, of like tenor and aggregate principal amount, which shall not bear
the Restricted Security Legend required by this Section 2.10. If such Restricted Security
surrendered for exchange is represented by a Global Security bearing the Restricted Security
Legend, the principal amount of the legended Global Securities shall be reduced by the appropriate
principal amount and the principal amount of a Global Security without the Restricted Security
Legend shall be increased by an equal principal amount. If a Global Security without the
Restricted Security Legend is not then outstanding, the Company shall execute and the Trustee shall
authenticate and deliver an unlegended Global Security to the Depositary.

     Section 2.11. Responsibilities and Obligations of the Trustee. The Trustee shall have no
responsibility or obligation to any Agent Members or any other Person with respect to the accuracy
of the books or records, or the acts or omissions, of the Depositary or its nominee or of any
participant or member thereof, with respect to any ownership interest in the Securities or with
respect to the delivery to any Agent Member or other Person (other than the Depositary) of any
notice (including any notice of redemption) or the payment of any amount, under or with respect to
such Securities. All notices and communications to be given to the Holders of Securities and all
payments to be made to Holders of Securities under the Securities shall be given or made only to or
upon the order of the registered Holders of Securities (which shall be the Depositary or its
nominee in the case of a Global Security). The rights of beneficial owners in any Global
Securities shall be exercised only through the Depositary subject to the customary procedures of
the Depositary. The Trustee may rely and shall be fully protected in relying upon information
furnished by the Depositary with respect to its Agent Members.

     The Trustee shall have no obligation or duty to monitor, determine or inquire as to compliance
with any restrictions on transfer imposed under this

22

 

Indenture or under applicable law with respect
to any transfer of any interest in any Securities (including any transfers between or among Agent
Members) other than to require delivery of such certificates and other documentation or evidence as
are expressly required by, and to do so if and when expressly required by, the terms of this
Indenture, and to examine the same to determine substantial compliance as to form with the express
requirements hereof.

     Section 2.12. Replacement Securities. If a mutilated Security is surrendered to the
Registrar or if the Securityholder of a Security claims that the Security has been lost, destroyed
or wrongfully taken, the Company shall issue and the Trustee shall authenticate a replacement
Security if the requirements of Section 8-405 of the Uniform Commercial Code are met, such that the
Securityholder (i) notifies the Company or the Trustee within a reasonable time after he has notice
of such loss, destruction or wrongful taking and the Registrar does not register a transfer prior
to receiving such notification, (ii) makes such request to the Company or the Trustee prior to the
Security being acquired by a protected purchaser as defined in Section 8-303 of the Uniform
Commercial Code (a “protected purchaser”) and (iii) satisfies any other reasonable requirements of
the Trustee and the Company. If required by the Trustee or the Company, such Securityholder shall
furnish an indemnity bond sufficient in the judgment of the Trustee to protect the Company, the
Trustee, the Paying Agent, the Conversion Agent and the Registrar from any loss that any of them
may suffer if a Security is replaced. The Company and the Trustee may charge the Securityholder
for their expenses in replacing a Security. In case any Security which has matured or is about to
mature or has been called for redemption or has been properly tendered for repurchase on a
Fundamental Change Repurchase Date (and not withdrawn) or has been tendered for repurchase on a
Repurchase Date (and not withdrawn), as the case may be, or is to be converted into Common Stock,
shall become mutilated or be destroyed, lost or stolen, the Company may, instead of issuing a
substitute Security, pay or authorize the payment of or convert or authorize the conversion of the
same (without surrender thereof except in the case of a mutilated Securities), as the case may be,
if the applicant for such payment or conversion shall furnish to the Company, to the Trustee and,
if applicable, to such authenticating agent such security or indemnity as may be required by them
to save each of them harmless for any loss, liability, cost or expense caused by or in connection
with such substitution, and, in every case of destruction, loss or theft, the applicant shall also
furnish to the Company, the Trustee and, if applicable, any Paying Agent or Conversion Agent
evidence to their satisfaction of the destruction, loss or theft of such Securities and of the
ownership thereof.

     Every replacement Security is an additional obligation of the Company.

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     The provisions of this Section 2.12 are exclusive and shall preclude (to the extent lawful)
all other rights and remedies with respect to the replacement or payment of mutilated, lost,
destroyed or wrongfully taken Securities.

     Section 2.13. Outstanding Securities. Securities outstanding at any time are all Securities
authenticated by the Trustee except for those canceled by it, those delivered to it for
cancellation and those described in this Section as not outstanding. A Security does not cease to
be outstanding because the Company or an Affiliate of the Company holds the Security.

     If a Security is replaced pursuant to Section 2.12, it ceases to be outstanding unless the
Trustee and the Company receive proof satisfactory to them that the replaced Security is held by a
protected purchaser.

     If the Paying Agent segregates and holds in trust, in accordance with this Indenture, on a
Redemption Date, Repurchase Date or Maturity Date money sufficient to pay all principal and
interest payable on that date with respect to the Securities (or portions thereof) to be redeemed,
repurchased or maturing, as the case may be, and the Paying Agent is not prohibited from paying
such money to the Securityholders on that date pursuant to the terms of this Indenture, then on and
after that date such Securities (or portions thereof) cease to be outstanding and interest on them
ceases to accrue.

     Section 2.14. Temporary Securities. Pending the preparation of Securities in certificated
form, the Company may execute and the Trustee or an authenticating agent appointed by the Trustee
shall, upon the written request of the Company, authenticate and deliver temporary Securities
(printed or lithographed). Temporary Securities shall be issuable in any authorized denomination,
and substantially in the form of the Securities in certificated form, but with such omissions,
insertions and variations as may be appropriate for temporary Security, all as may be determined by
the Company. Every such temporary Securities shall be executed by the Company and authenticated by
the Trustee or such authenticating agent upon the same conditions and in substantially the same
manner, and with the same effect, as the Securities in certificated form. Without unreasonable
delay, the Company will execute and deliver to the Trustee or such authenticating agent Securities
in certificated form and thereupon any or all temporary Securities may be surrendered in exchange
therefor, at each office or agency maintained by the Company pursuant to Section 4.02 and the
Trustee or such authenticating agent shall authenticate and make available for delivery in exchange
for such temporary Securities an equal aggregate principal amount of Securities in certificated
form. Such exchange shall be made by the Company at its own expense and without any charge
therefor. Until so exchanged, the temporary Securities shall in all respects be entitled to the
same benefits and

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subject to the same limitations under this Indenture as Securities in
certificated form authenticated and delivered hereunder.

     Section 2.15. Cancellation. The Company at any time may deliver Securities to the Trustee
for cancellation. The Registrar and the Paying Agent shall forward to the Trustee any Securities
surrendered to them for registration of transfer, exchange or payment. The Trustee and no one else
shall cancel all Securities surrendered for registration of transfer, exchange, payment or
cancellation and deliver canceled Securities to the Company pursuant to written direction by an
Officer. The Company may not issue new Securities to replace Securities it has redeemed, paid or
delivered to the Trustee for cancellation. The Trustee shall not authenticate Securities in place
of canceled Securities other than pursuant to the terms of this Indenture.

     Section 2.16. CUSIP and ISIN Numbers. The Company in issuing the Securities may use “CUSIP”
and “ISIN” numbers (if then generally in use) and, if so, the Trustee shall use “CUSIP” and “ISIN”
numbers in notices of redemption as a convenience to Securityholders; provided that any such notice
may state that no representation is made as to the correctness of such numbers either as printed on
the Securities or as contained in any notice of a redemption and that reliance may be placed only
on the other identification numbers printed on the Securities, and any such redemption shall not be
affected by any defect in or omission of such numbers.

     Section 2.17. Additional Securities. The Company may, from time to time without the consent
of the Holders of outstanding Securities, increase the principal amount of the Securities by
issuing additional Securities in the future pursuant to this Indenture (“Additional Securities”)
having terms and conditions identical to those of the other outstanding Securities, except that
Additional Securities may have a different initial date from which interest begins to accrue
thereon so that the Additional Securities are fungible with outstanding Securities; provided that
no differences pursuant to this Section 2.17 shall cause such Additional Securities to constitute a
different class of securities than the Securities issued pursuant to the Purchase Agreement for
U.S. federal income tax purposes; and provided further, that the Additional Securities shall have
the same CUSIP number as the Securities issued pursuant to the Purchase Agreement. The Securities
originally issued pursuant to the Purchase Agreement and any Additional Securities shall be treated
as a single class for all purposes under this Indenture, including waivers, amendments,
redemptions, offers to purchase and United States federal tax purposes. No Additional Securities
may be issued if on the issue date therefor any Event of Default has occurred and is continuing.

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ARTICLE 3

Redemption and Repurchase of Securities

     Section 3.01. Optional Redemption of Securities. At any time on or after August 20, 2014,
the Securities may be redeemed at the option of the Company,
in whole or in part, upon notice as set forth in Section 3.02, in cash at the redemption price
(the “Redemption Price”) equal to 100% of the principal amount thereof. In addition, the Company
will pay interest on the Securities being redeemed, which interest will include such interest
accrued and unpaid to, but excluding, the redemption date (the “Redemption Date”). The Company may
not redeem any Securities if the principal amount of the Securities has been accelerated (other
than as a result of a failure to pay the relevant Redemption Price), and such acceleration has not
been rescinded, on or prior to the relevant Redemption Date.

     Section 3.02. Notice of Optional Redemption; Selection of Securities to be Redeemed. If the
Company shall desire to exercise the right to redeem all or, as the case may be, any part of the
Securities pursuant to Section 3.01, it shall fix a date for redemption and it or, at its written
request received by the Trustee not fewer than five Business Days prior (or such shorter period of
time as may be acceptable to the Trustee) to the date the notice of redemption is to be mailed, the
Trustee in the name of and at the expense of the Company, shall mail or cause to be mailed a notice
of such redemption not less than 30 nor more than 60 Business Days prior to the Redemption Date to
each Holder of Securities so to be redeemed in whole or in part at its last address as the same
appears on the Register of the Registrar; provided that if the Company makes such request of the
Trustee, the Company shall provide the Trustee with the text of the notice of redemption and shall
give written notice of the Redemption Date to the Trustee. Such mailing shall be by first class
mail. The notice, if mailed in the manner herein provided, shall be conclusively presumed to have
been duly given, whether or not the Holder receives such notice. In any case, failure to give such
notice by mail or any defect in the notice to the Holder of any Securities designated for
redemption as a whole or in part shall not affect the validity of the proceedings for the
redemption of any other Securities.

     Each such notice of redemption shall specify: (i) the aggregate principal amount of Securities
to be redeemed, (ii) the CUSIP number or numbers of the Securities being redeemed, (iii) the date
fixed for redemption (which shall be a Business Day), (iv) the Redemption Price at which Securities
are to be redeemed, (v) the place or places of payment and that payment will be made upon
presentation and surrender of such Securities, (vi) that interest accrued and unpaid to, but
excluding, the date fixed for redemption will be paid as specified in said notice, and that on and
after said date interest thereon or on the portion thereof to be redeemed will cease to accrue,
(vii) that the Holder has a right to convert the

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Securities called for redemption, (viii) the
Conversion Rate on the date of such notice, (ix) the time and date on which the right to convert
such Securities or portions thereof will expire and (x) the formula for determining the amount of
cash and the number of shares, if any, to be delivered to the Holder upon conversion pursuant to
Section 10.13 and the date on which the Conversion Observation Period begins. If fewer than all
the Securities are to be redeemed, the
notice of redemption shall identify the Securities to be redeemed (including CUSIP numbers, if
any). If any Securities are to be redeemed in part only, the notice of redemption shall state the
portion of the principal amount thereof to be redeemed and shall state that, on and after the
Redemption Date, upon surrender of such Securities, a new Security or Securities in principal
amount equal to the unredeemed portion thereof will be issued.

     Whenever any Securities are to be redeemed, the Company will give the Trustee written notice
of the Redemption Date, together with an Officers’ Certificate as to the aggregate principal amount
of Securities to be redeemed not fewer than 30 calendar days (or such shorter period of time as may
be acceptable to the Trustee) prior to the Redemption Date.

     On or prior to the Redemption Date specified in the notice of redemption given as provided in
this Section 3.02, the Company will deposit with the Paying Agent (or, if the Company is acting as
its own Paying Agent, set aside, segregate and hold in trust as provided in Section 2.06) an amount
of money in immediately available funds sufficient to redeem on the Redemption Date all the
Securities (or portions thereof) so called for redemption (other than those theretofore surrendered
for conversion) at the appropriate Redemption Price, together with accrued and unpaid interest to,
but excluding, the Redemption Date; provided that if such payment is made on the Redemption Date,
it must be received by the Paying Agent, by 11:00 a.m., New York City time, on such date. If any
Securities called for redemption are converted pursuant hereto prior to such Redemption Date, any
money deposited with the Paying Agent or so segregated and held in trust for the redemption of such
Securities shall be paid to the Company or, if then held by the Company, shall be discharged from
such trust.

     If less than all of the outstanding Securities are to be redeemed, the Trustee shall select
the Securities or portions thereof of the Global Securities or the Securities in certificated form
to be redeemed (in principal amounts of $1,000 or integral multiples thereof) by lot, on a pro rata
basis or by another method the Trustee deems fair and appropriate (and in such manner as complies
with applicable legal requirements). If any Security selected for redemption is submitted for
conversion in part after such selection, the portion of such Securities submitted for conversion
shall be deemed (so far as may be possible) to be the portion to be selected for redemption. The
Securities (or portions thereof) so selected for redemption shall be deemed duly selected for
redemption for all

27

 

purposes hereof, notwithstanding that any such Securities are submitted for
conversion in part before the mailing of the notice of redemption.

     Upon any redemption of less than all of the outstanding Securities, the Company and the
Trustee may (but need not), solely for purposes of determining the pro rata allocation among such
Securities that are unconverted and outstanding at the time of redemption, treat as outstanding any
Securities surrendered for conversion during the period of 15 calendar days preceding the
mailing of a notice of redemption and may (but need not) treat as outstanding any Securities
authenticated and delivered during such period in exchange for the unconverted portion of any
Securities converted in part during such period.

     Section 3.03. Payment of Securities Called for Redemption. If notice of redemption has been
given as provided in Section 3.02, the Securities or portion of Securities with respect to which
such notice has been given shall, unless converted pursuant to the terms hereof, become due and
payable on the date fixed for redemption and at the place or places stated in such notice at the
Redemption Price, and interest accrued and unpaid to, but excluding, the Redemption Date shall be
paid to the Holder of the Securities or portion of the Securities to be redeemed on the Redemption
Date; provided that if a Redemption Date is after an Interest Record Date and on or before an
interest payment date, the interest shall be paid on the Redemption Date to the Holders of record
of such Securities on the applicable Interest Record Date instead of the Holders surrendering such
Securities for redemption on such date. Unless the Company shall default in the payment of such
Securities at the Redemption Price, plus interest, if any, accrued and unpaid to, but excluding,
the applicable Redemption Date, interest on the Securities or portion of Securities so called for
redemption, shall cease to accrue on and after such date and, after 5:00 p.m., New York City time,
on the Business Day immediately preceding the Redemption Date (unless the Company shall default in
the payment of such Securities at the Redemption Price, together with interest accrued to such
date) such Securities shall cease to be convertible and, except as provided in Section 2.06 and
Section 8.02, to be entitled to any benefit or security under this Indenture, and the Holders
thereof shall have no right in respect of such Securities except the right to receive the
Redemption Price thereof plus accrued and unpaid interest to, but excluding, the Redemption Date.
On presentation and surrender of such Securities at a place of payment in said notice specified,
the said Securities or the specified portions thereof shall be paid and redeemed by the Company at
the Redemption Price, together with interest accrued and unpaid thereon to, but excluding, the
Redemption Date.

     If on the Redemption Date the Paying Agent holds, in accordance with the terms hereof, cash
sufficient to pay the Redemption Price and related accrued interest, of any Security to be redeemed on the Redemption Date in
accordance with this Indenture then, on the Redemption Date such Security will cease to be
outstanding, whether or not book-

28

 

entry transfer of the Security has been made or the Security is
delivered to the Paying Agent, as the case may be, and interest, shall cease to accrue, and the
rights of the Holder in respect of the Security shall terminate (other than the right to receive
the Redemption Price as aforesaid upon delivery or transfer of the Securities in accordance with
this Indenture).

     Upon presentation of any Securities redeemed in part only, the Company shall execute and the
Trustee shall authenticate and make available for delivery to the Holder thereof, at the expense of
the Company, a new Security or Securities of
authorized denominations, in principal amount equal to the unredeemed portion of the
Securities so presented.

     Notwithstanding the foregoing, the Trustee shall not redeem any Securities or mail any notice
of redemption if the principal amount of the Securities has been accelerated (other that as a
result to pay the relevant Redemption Price), and such acceleration has not been rescinded, on or
prior to the relevant Redemption Date. If any Securities called for redemption shall not be so
paid upon surrender thereof for redemption on the Redemption Date as provided in this Section 3.03,
to the extent legally permissible, the Redemption Price shall, until paid or duly provided for,
bear interest from and including the Redemption Date at the interest rate borne by the Securities
and such Securities shall remain convertible into Common Stock until the Redemption Price and
interest shall have been paid or duly provided for.

     Section 3.04. Repurchase at Option of Holders Upon a Fundamental Change. (a) If there shall
occur a Fundamental Change at any time prior to maturity of the Securities, then each Holder of
Securities shall have the right, at such Holder’s option, to require the Company to repurchase, at
the Fundamental Change Repurchase Price (as defined below), all of such Holder’s Securities, or any
portion thereof that is a multiple of $1,000 principal amount, on a date (the “Fundamental Change
Repurchase Date”) specified by the Company, that is not less than 20 nor more than 35 calendar days
after the date of the Company Repurchase Notice related to such Fundamental Change at a cash
repurchase price equal to 100% of the principal amount of the Securities being repurchased, plus
accrued and unpaid interest to, but excluding, the Fundamental Change Repurchase Date (the
“Fundamental Change Repurchase Price”), subject to the satisfaction by the Holder of the
requirements set forth in Section 3.04(c); provided that if such Fundamental Change Repurchase Date
falls after an Interest Record Date and on or prior to the corresponding interest payment date,
then the interest payable on the Fundamental Change Repurchase Date shall be paid on the
Fundamental Change Repurchase Date to the Holders of record of the Securities on the applicable
Interest Record Date instead of the Holders surrendering the Securities for repurchase on such
date.

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     (b) On or before the fifteenth calendar day after the occurrence of a Fundamental Change, the
Company will provide to the Trustee and to all Holders of record of the Securities on the date of
the Fundamental Change at their addresses shown in the Register of the Registrar and to beneficial
owners of the Securities to the extent required by applicable law, the Company Repurchase Notice as
set forth in Section 3.06 with respect to such Fundamental Change.

     No failure of the Company to give the foregoing notices and no defect therein shall limit the
repurchase rights of Holders of Securities or affect the validity of the proceedings for the
repurchase of the Securities pursuant to this Section 3.04.

     (c) For Securities to be repurchased at the option of the Holder, the Holder must deliver to
the Paying Agent, prior to 5:00 p.m., New York City time, on the Fundamental Change Repurchase
Date, (i) a written notice to the Paying Agent of exercise of repurchase (the “Fundamental Change
Repurchase Notice”) in the form set forth on the reverse of the Securities duly completed (if the
Securities are certificated) or comply with applicable Depositary procedures (if the Securities are
represented by a Global Security), together with (ii) such Securities duly endorsed for transfer
(if the Securities are certificated) or book-entry transfer of such Securities (if the Securities
are represented by a Global Security). The delivery of such Securities to the Paying Agent with,
or at any time after delivery of, the Fundamental Change Repurchase Notice (together with all
necessary endorsements) at the office of the Paying Agent shall be a condition to payment by the
Company to the Holder of the Fundamental Change Repurchase Price therefor; provided that such
Fundamental Change Repurchase Price shall be so paid pursuant to this Section 3.04 only if the
Securities so delivered to the Paying Agent shall conform in all respects to the description
thereof in the Fundamental Change Repurchase Notice. All questions as to the validity, eligibility
(including time of receipt) and acceptance of any Securities for repurchase shall be determined by
the Company, whose determination shall be final and binding absent manifest error.

     (d) The Company shall repurchase from the Holder thereof, pursuant to this Section 3.04, a
portion of a Security, if the principal amount of such portion is $1,000 or a whole multiple of
$1,000. Provisions of this Indenture that apply to the repurchase of all of a Security also apply
to the repurchase of such portion of such Security.

     (e) The Paying Agent shall promptly notify the Company of the receipt by it of any Fundamental
Change Repurchase Notice or written notice of withdrawal thereof.

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     Any repurchase by the Company contemplated pursuant to the provisions of this Section 3.04
shall be consummated by the delivery of the consideration to be received by the Holder promptly
following the later of the Fundamental Change Repurchase Date and the time of the book-entry
transfer or delivery of the Securities.

     Section 3.05. Repurchase of Securities by the Company at the Option of Holders. (a) Each
Holder of Securities shall have the right, at such Holder’s option, to require the Company to
repurchase all of such Holder’s Securities, or any portion thereof that is a multiple of $1,000
principal amount, on August 15, 2014, August 15, 2017 and August 15, 2022 (each, a “Repurchase
Date”), at a repurchase price of 100% of the principal amount of the Securities being repurchased,
plus accrued and unpaid interest to, but excluding, the Repurchase Date (the “Repurchase Price”).
However, if such Repurchase Date falls after an Interest Record Date and on or prior to the
corresponding interest payment date,
then the interest payable on such interest payment date shall be paid on the Repurchase Date
to the Holders of record of the Securities on the applicable Interest Record Date instead of the
Holders surrendering the Securities for repurchase on such date.

     (b) On or before the 20th Business Day prior to each Repurchase Date, the Company
shall mail or cause to be mailed to all Holders of record on such date at their addresses shown in
the Register of the Registrar (and to beneficial owners as required by applicable law) a Company
Repurchase Notice as set forth in Section 3.06.

     No failure of the Company to give the foregoing notices and no defect therein shall limit the
repurchase rights of Holders of Securities or affect the validity of the proceedings for the
repurchase of the Securities pursuant to this Section 3.05.

     (c) For Securities to be so repurchased at the option of the Holder, the Holder must deliver
to the Paying Agent, at any time during the period beginning at 9:00 a.m., New York City time, on
the date that is 20 Business Days prior to the applicable Repurchase Date and ending at 5:00 p.m.,
New York City time, on the Business Day immediately preceding the applicable Repurchase Date, (i) a
notice (the “Repurchase Notice”) in the form set forth on the reverse of the Securities duly
completed (if the Securities are certificated) or comply with applicable Depositary procedures (if
the Securities are represented by a Global Security) together with (ii) such Securities duly
endorsed for transfer (if the Securities are certificated) or book-entry transfer of such
Securities (if such Securities are represented by a Global Security). The delivery of such
Securities to the Paying Agent with, or at any time after delivery of, the Repurchase Notice
(together with all necessary endorsements) at the office of the Paying Agent shall

31

 

be a condition
to the payment by the Company to the Holder of the repurchase price therefor; provided that such
repurchase price shall be so paid pursuant to this Section 3.05 only if the Securities so delivered
to the Paying Agent shall conform in all respects to the description thereof in the Repurchase
Notice. All questions as to the validity, eligibility (including time of receipt) and acceptance
of any Securities for repurchase shall be determined by the Company, whose determination shall be
final and binding absent manifest error.

     (d) The Company shall repurchase from the Holder thereof, pursuant to this Section 3.05, a
portion of a Security, if the principal amount of such portion is $1,000 or a whole multiple of
$1,000. Provisions of this Indenture that apply to the repurchase of all of a Security also apply
to the repurchase of such portion of such Securities.

     (e) The Paying Agent shall promptly notify the Company of the receipt by it of any Repurchase
Notice or written notice of withdrawal thereof.

     Any repurchase by the Company contemplated pursuant to the provisions of this Section 3.05
shall be consummated by the delivery of the consideration to be received by the Holder promptly
following the later of the Repurchase Date and the time of the book-entry transfer or delivery of
the Securities, as the case may be.

     Section 3.06. Company Repurchase Notice; Tender Offer Compliance. (a) In connection with
any repurchase of Securities, the Company shall, in the case of a Fundamental Change, on or before
the fifteenth calendar day after the occurrence of such Fundamental Change or, no less than 20
Business Days prior to each Repurchase Date, give notice to Holders (with a copy to the Trustee)
setting forth information specified in this Section 3.06 (in either case, the “Company Repurchase
Notice”).

     Each Company Repurchase Notice shall:

     (1) state the Repurchase Price or the Fundamental Change Repurchase Price, as applicable, and
the Fundamental Change Repurchase Date or the Repurchase Date, as applicable, to which the Company
Repurchase Notice relates;

     (2) state, if applicable, the circumstances constituting the Fundamental Change;

     (3) state that the Repurchase Price or the Fundamental Change Repurchase Price, as applicable,
will be paid in cash;

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     (4) state that Holders must exercise their right to elect repurchase by 5:00 p.m., New York
City time, on the Fundamental Change Repurchase Date or on the Business Day immediately preceding
the Repurchase Date, as the case may be;

     (5) include a form of Repurchase Notice or Fundamental Change Repurchase Notice, as
applicable;

     (6) state the name and address of the Paying Agent;

     (7) state that Securities must be surrendered to the Paying Agent to collect the repurchase
price;

     (8) state that a Holder may withdraw its Repurchase Notice or Repurchase Notice or Fundamental
Change Repurchase Notice, as applicable, at any time prior to 5:00 p.m., New York City time, on the
Business Day immediately preceding the Repurchase Date or the Fundamental Change Repurchase Date,
as the case may be, by delivering a valid written notice of withdrawal in accordance with Section
3.07;

     (9) state whether the Securities are then convertible, the then applicable Conversion Rate,
including, in the case of the occurrence of a Fundamental Change, expected changes, if any, in the
Conversion Rate resulting from such Fundamental Change transaction and expected changes in the
cash, shares or other property deliverable upon conversion of the Securities as a result of the
occurrence of the Fundamental Change;

     (10) that Securities as to which a Fundamental Change Repurchase Notice has been given may be
converted only if the Fundamental Change Repurchase Notice is withdrawn in accordance with the
terms of this Indenture;

     (11) state the amount of interest accrued and unpaid per $1,000 principal amount of Securities
to, but excluding, the Fundamental Change Repurchase Date or Repurchase Date, as the case may be;
and

     (12) state the CUSIP number of the Securities.

     A Company Repurchase Notice may be given by the Company or, at the Company’s request, the Trustee
shall give such Company Repurchase Notice in the Company’s name and at the Company’s expense;
provided that the text of the Company Repurchase Notice shall be prepared by the Company.

     (a) The Company will, to the extent applicable: (i) comply with the provisions of Rule 13e-4
and Rule 14e-1 (or any successor provision) under the Exchange Act that may be applicable at the
time of the repurchase of the

33

 

Securities, (ii) file the related Schedule TO (or any successor
schedule, form or report) under the Exchange Act or any other schedule required in connection with
any offer by the Company to repurchase the Securities and (iii) comply with all other federal and
state securities laws in connection with any offer by the Company to repurchase the Securities.

     Section 3.07. Effect of Repurchase Notice; Withdrawal. Upon receipt by the Paying Agent of
the Fundamental Change Repurchase Notice specified in Section 3.04 or of the Repurchase Notice
specified in Section 3.05, as applicable, the Holder of the Securities in respect of which such
Fundamental Change Repurchase Notice or Repurchase Notice, as applicable, was given shall (unless
such Fundamental Change Repurchase Notice or the Repurchase Notice, as applicable, is validly
withdrawn in accordance with the following paragraph) thereafter be entitled to receive solely the
repurchase price with respect to such Securities. Such repurchase price shall be paid to such
Holder, subject to receipt of funds and/or the Securities by the Paying Agent, promptly following
the later of (x) the Fundamental Change Repurchase Date or Repurchase Date, as applicable, with
respect to such Securities (provided the Holder has satisfied the conditions in Section 3.04 or
Section 3.05, as applicable) and (y) the time of book-entry transfer or delivery of such Securities
to the Paying Agent by the Holder thereof in the manner required by Section 3.04 or Section 3.05,
as
applicable. The Securities in respect of which a Fundamental Change Repurchase Notice or a
Repurchase Notice, as applicable, has been given by the Holder thereof may not be converted
pursuant to Article 10 hereof on or after the date of the delivery of such Fundamental Change
Repurchase Notice or such Repurchase Notice, as applicable, unless such Fundamental Change
Repurchase Notice or such Repurchase Notice, as applicable, has first been validly withdrawn.

     A Fundamental Change Repurchase Notice or Repurchase Notice, as applicable, may be withdrawn
by means of a written notice of withdrawal delivered to the office of the Paying Agent in
accordance with the Fundamental Change Repurchase Notice or the Repurchase Notice, as applicable,
at any time prior to 5:00 p.m., New York City time, on the Business Day immediately preceding the
Fundamental Change Repurchase Date or the Repurchase Date, as the case may be, specifying:

     (a) the certificate number, if any, of the Securities in respect of which such notice of
withdrawal is being submitted if they are in certificated form, or the appropriate Depositary
information, in accordance with appropriate Depositary procedures, if the Securities in respect of
which such notice of withdrawal is being submitted is represented by a Global Security,

     (b) the principal amount of the Securities with respect to which such notice of withdrawal is
being submitted, and

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     (c) the principal amount, if any, of such Securities which remains subject to the original
Fundamental Change Repurchase Notice or the Repurchase Notice, as applicable, which shall be $1,000
or a whole multiple of $1,000.

     If a Fundamental Change Repurchase Notice or Repurchase Notice, as applicable, is properly
withdrawn, the Company shall not be obligated to repurchase the Securities listed in such
Fundamental Change Repurchase Notice or Repurchase Notice, as applicable.

     Section 3.08. Deposit of Repurchase Price or Fundamental Change Repurchase Price. Prior to
11:00 a.m., New York City time, on the Fundamental Change Repurchase Date or the Repurchase Date,
as applicable, the Company shall deposit with the Paying Agent or, if the Company is acting as the
Paying Agent, shall segregate and hold in trust as provided in Section 2.06, an amount of cash (in
immediately available funds if deposited on the Fundamental Change Repurchase Date or the
applicable Repurchase Date, as the case may be), sufficient to pay the aggregate repurchase price
of all the Securities or portions thereof that are to be repurchased as of the Fundamental Change
Repurchase Date or the Repurchase Date, as the case may be.

     If on the Fundamental Change Repurchase Date or a Repurchase Date the Paying Agent holds cash
sufficient to pay the repurchase price and related accrued
interest of the Securities that Holders have elected to require the Company to repurchase in
accordance with Section 3.04 or 3.05, as the case may be, then, on the Fundamental Change
Repurchase Date or the applicable Repurchase Date, as the case may be, such Securities will cease
to be outstanding, and interest will cease to accrue (whether or not book entry transfer or
delivery of the Securities has been made to the Paying Agent) and all other rights of the Holders
of such Securities will terminate, other than the right to receive the repurchase price and any
accrued interest upon delivery or book-entry transfer of the Securities. This will be the case
whether or not book-entry transfer of the Securities has been made or the Securities has been
delivered to the Paying Agent.

     Section 3.09. Securities Repurchased in Part. Upon presentation of any Securities
repurchased only in part, the Company shall execute and the Trustee shall authenticate and make
available for delivery to the Holder thereof, at the expense of the Company, a new Security or
Securities, of any authorized denomination, in aggregate principal amount equal to the
unrepurchased portion of the Securities presented.

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ARTICLE 4

Covenants

     Section 4.01. Payment of Securities. The Company shall promptly pay the principal of and
interest on the Securities on the dates and in the manner
provided in the Securities and in this Indenture in each such case, prior to 11:00 a.m., New
York City time. Principal and interest shall be considered paid on the date due if on such date
the Trustee or the Paying Agent holds in accordance with this Indenture money sufficient to pay all
principal and interest then due and the Trustee or the Paying Agent, as the case may be, is not
prohibited from paying such money to the Securityholders on that date pursuant to the terms of this
Indenture.

     Section 4.02. Maintenance of Office or Agency. The Company will maintain an office or agency
in the United States where the Securities may be surrendered for registration of transfer or
exchange or for presentation for payment or for conversion, redemption or repurchase and where
notices and demands to or upon the Company in respect of the Securities and this Indenture may be
served. As of the date of this Indenture, such office is located at the office of the Trustee
located at 100 Wall Street, Suite 1600, New York, NY 10005 and, at any other time, at such other
address as the Trustee may designate from time to time by notice to the Company. The Company will
give prompt written notice to the Trustee of the location, and any change in the location, of such
office or agency not designated or appointed by the Trustee. If at any time the Company shall fail
to maintain any such required office or agency or shall fail to furnish the Trustee with the
address thereof, such presentations, surrenders, notices and demands may be made or served at the
Corporate Trust Office.

     The Company may also from time to time designate co-registrars and one or more offices or
agencies where the Securities may be presented or surrendered for any or all such purposes and may
from time to time rescind such designations. The Company will give prompt written notice to the
Trustee of any such designation or rescission and of any change in the location of any such other
office or agency.

     Section 4.03. Rule 144A Information. The Company covenants and agrees that it shall, during
any period in which it is not subject to Section 13 or 15(d) under the Exchange Act, make available
to any holder or beneficial holder of Securities or any Common Stock issued upon conversion thereof
which continue to be Restricted Securities and any prospective purchaser of Securities or such
Common Stock designated by such holder or beneficial holder, the information required pursuant to
Rule 144A(d)(4) under the Securities Act upon the request of any holder or beneficial holder of the
Securities or such Common Stock, all to the extent required to enable such holder or beneficial
holder to sell

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its Securities or Common Stock without registration under the Securities Act within
the limitation of the exemption provided by Rule 144A.

     Section 4.04. Existence. Subject to Article 5, the Company will do or cause to be done all
things necessary to preserve and keep in full force and effect its existence and rights (charter
and statutory); provided that the Company shall not be required to preserve any such right if the
Company shall determine that the
preservation thereof is no longer desirable in the conduct of the business of the Company and
that the loss thereof is not disadvantageous in any material respect to the Holders of Securities.

     Section 4.05. Payment of Taxes and Other Claims. The Company will pay or discharge, or cause
to be paid or discharged, before the same may become delinquent, (i) all taxes, assessments and
governmental charges levied or imposed upon the Company or any Significant Subsidiary or upon the
income, profits or property of the Company or any Significant Subsidiary, (ii) all claims for
labor, materials and supplies which, if unpaid, might by law become a lien or charge upon the
property of the Company or any Significant Subsidiary and (iii) all stamp taxes and other duties,
if any, which may be imposed by the United States or any political subdivision thereof or therein
in connection with the issuance, transfer, exchange, conversion, redemption or repurchase of any
Securities or with respect to this Indenture; provided that, in the case of clauses (i) and (ii),
the Company shall not be required to pay or discharge or cause to be paid or discharged any such
tax, assessment, charge or claim (A) if the failure to do so will not, in the aggregate, have a
material adverse impact on the Company, or (B) if the amount, applicability or validity is being
contested in good faith by appropriate proceedings.

     Section 4.06. Compliance Certificate. The Company shall deliver to the Trustee within 120
days after the end of each fiscal year of the Company an Officers’ Certificate stating, as to each
such Officer signing such certificate, whether to such Officer’s knowledge the Company during such
preceding fiscal year has kept, observed, performed and fulfilled the covenants contained in this
Indenture and, if the Company shall be in Default, the certificate shall describe the Default, its
status and what action the Company is taking or proposes to take with respect thereto. The Company
also shall comply with Section 314(a)(4) of the TIA.

     Section 4.07. Additional Interest Notice. If the Company is required to pay Additional
Interest to Holders of Securities pursuant to the Registration Rights Agreement or Section 6.13,
the Company will provide written notice (“Additional Interest Notice”) to the Trustee of its
obligation to pay Additional Interest no later than two Business Days prior to the proposed payment
date for Additional Interest, and the Additional Interest Notice shall set forth the amount

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of
Additional Interest to be paid by the Company on such payment date. The Trustee shall not at any
time be under any duty or responsibility to any Holder of Securities to determine the Additional
Interest, or with respect to the nature, extent or calculation of the amount of Additional Interest
when made, or with respect to the method employed in such calculation of the Additional Interest.

     Section 4.08. Exchange Act Reports. The Company shall deliver to the Trustee, within fifteen
days after the Company is required to file the same with the SEC, copies of the Company’s annual
reports and of the information,
documents and other reports (or copies of such portions of any of the foregoing as the SEC may
by rules and regulations prescribe) that the Company is required to file with the SEC pursuant to
Section 13 or Section 15(d) of the Exchange Act. Reports, information and documents filed by the
Company with the SEC via the EDGAR system will be deemed filed with the Trustee for purposes of
this Section 4.08 as of the time that such reports, information and documents are filed via EDGAR.

ARTICLE 5

Successor Company

     Section 5.01. When Company May Merge or Transfer Assets. The Company shall not in a single
transaction or a series of related transactions consolidate with or merge with or into any other
Person (other than a Subsidiary of the Company), or sell, convey, transfer or lease its property
and assets substantially as an entirety to any Person (other than to one or more of the
Subsidiaries of the Company as an entirety or substantially as an entirety), unless:

     (a) either (i) the Company is the continuing corporation, or (ii) the resulting, surviving or
transferee person (if other than the Company) is a corporation or limited liability company
organized and existing under the laws of the United States, any state thereof or the District of
Columbia and such person assumes, by a supplemental indenture in a form reasonably satisfactory to
the Trustee, all of the Company’s obligations under the Securities and this Indenture;

     (b) immediately after giving effect to the transaction described above, no Default or Event of
Default, has occurred and is continuing;

     (c) if as a result of such transaction the Securities become convertible into common stock or
other securities issued by a third party, such third party fully and unconditionally guarantees all
obligations of the Company or such successor under the Securities and this Indenture; and

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     (d) the Company has delivered to the Trustee the Officers’ Certificate and Opinion of Counsel,
if any, requested by the Trustee pursuant to this Indenture.

     Section 5.02. Successor to be Substituted. In case of any such consolidation, merger, sale,
conveyance, transfer or lease in which the Company is not the continuing corporation and upon the
assumption by the successor Person, by supplemental indenture, executed and delivered to the
Trustee and reasonably satisfactory in form and substance to the Trustee, of the due and punctual
payment of the principal of, and interest on all of the Securities, and the due and punctual
performance and observance of all of the covenants and conditions of this Indenture to be performed
or satisfied by the Company, such
successor Person shall succeed to and be substituted for the Company, with the same effect as
if it had been named herein as a party hereto, and Nuance Communications, Inc. shall be discharged
from its obligations under the Securities and this Indenture. Such successor Person thereupon may
cause to be signed, and may issue the Securities either in its own name or in the name of Nuance
Communications, Inc.

     Upon the order of such successor Person instead of the Company and subject to all the terms,
conditions and limitations in this Indenture prescribed, the Trustee shall authenticate and shall
deliver, or cause to be authenticated and delivered, any Securities that previously shall have been
signed and delivered by the officers of the Company to the Trustee for authentication, and any
Securities that such successor Person thereafter shall cause to be signed and delivered to the
Trustee for that purpose. All the Securities so issued shall in all respects have the same legal
rank and benefit under this Indenture as the Securities theretofore or thereafter issued in
accordance with the terms of this Indenture as though all of such Securities had been issued at the
date of the execution hereof. In the event of any such consolidation, merger, sale, conveyance,
transfer or lease, upon compliance with this Article 5 the Person named as the “Company” in the
first paragraph of this Indenture or any successor that shall thereafter have become such in the
manner prescribed in this Article 5 may be dissolved, wound up and liquidated at any time
thereafter and such Person shall be discharged from its liabilities as obligor and maker of the
Securities and from its obligations under this Indenture.

     Section 5.03. Opinion of Counsel to be Given to Trustee. Prior to execution of any
supplemental indenture pursuant to this Article 5, if so requested by the Trustee, the Trustee
shall receive an Officers’ Certificate and an Opinion of Counsel as conclusive evidence that any
such consolidation, merger, sale, conveyance, transfer or lease and any such assumption complies
with the provisions of this Article 5.

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ARTICLE 6

Defaults and Remedies

     Section 6.01. Events of Default. An “Event of Default” occurs if:

     (a) the Company defaults in any payment of interest on any Security when the same becomes due
and payable and such default continues for a period of 30 calendar days;

     (b) the Company defaults in the payment of the principal of any Security when the same becomes
due and payable at maturity, or the Company defaults in the payment of the Redemption Price, the
Fundamental Change Repurchase Price or the Repurchase Price, in each case when due;

     (c) the Company fails to deliver cash and, if applicable, shares of Common Stock (including
any Additional Shares), or a combination of the foregoing, as required pursuant to Article 10 upon
the conversion of any Securities and such failure continues for five Business Days following the
scheduled settlement date for such conversion;

     (d) the Company fails to provide notice of the anticipated effective date or actual effective
date of a Fundamental Change on a timely basis as required in this Indenture;

     (e) the Company fails to perform or observe any other term, covenant or agreement contained in
the Securities or this Indenture (other than those referred to in (a), (b), (c) or (d) above) and
such failure continues for 60 days after receipt by the Company of a Notice of Default;

     (f) a failure to pay when due (whether at stated maturity or otherwise) by the Company or any
Significant Subsidiary of the Company, after the expiration of any applicable grace period, of
principal of or interest on indebtedness for borrowed money, where the amount of such unpaid
principal and/or interest is in an aggregate amount in excess of $35 million or more (or a foreign
currency equivalent), or a default that results in the acceleration of maturity, of any
indebtedness for borrowed money of the Company or any Significant Subsidiary of the Company in an
aggregate amount in excess of $35 million (or its foreign currency equivalent at the time), in each
case if such Indebtedness is not discharged and such acceleration is not rescinded, stayed or
annulled, within a period of 30 calendar days after receipt by the Company of a Notice of Default;

     (g) a final judgment for the payment of $35 million or more (excluding any amounts covered by
insurance or subject to a binding indemnity from a

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financially responsible third party with
resources sufficient to pay such indemnity obligation when due) rendered against the Company or any
Significant Subsidiary of the Company, which judgment is not discharged or stayed within 90 days
after (i) the date on which the right to appeal thereof has expired if no such appeal has
commenced, or (ii) the date on which all rights to appeal have been extinguished;

     (h) the Company or any Significant Subsidiary of the Company pursuant to or within the meaning
of any Bankruptcy Law:

     (i) commences a voluntary case;

     (ii) consents to the entry of an order for relief against it in an involuntary case;

     (iii) consents to the appointment of a Custodian of it or for any substantial part of
its property; or

     (iv) makes a general assignment for the benefit of its creditors;

or takes any comparable action under any foreign laws relating to insolvency;

     (i) a court of competent jurisdiction enters an order or decree under any Bankruptcy Law that:

     (i) is for relief against the Company or any Significant Subsidiary of the Company in
an involuntary case;

     (ii) appoints a Custodian of the Company or any Significant Subsidiary of the Company
or for any substantial part of its property; or

     (iii) orders the winding up or liquidation of the Company or any Significant
Subsidiary of the Company;

or any similar relief is granted under any foreign laws, and, in each such case, the order or
decree remains unstayed and in effect for 60 consecutive days.

     The foregoing shall constitute Events of Default whatever the reason for any such Event of
Default and whether it is voluntary or involuntary or is effected by operation of law or pursuant
to any judgment, decree or order of any court or any order, rule or regulation of any
administrative or governmental body.

     The term “Bankruptcy Law” means Title 11, United States Code, or any similar Federal
or state law for the relief of debtors. The term “Custodian” means any receiver, trustee,
assignee, liquidator, custodian or similar official under any Bankruptcy Law.

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     A Default under clause (e) or (f) above is not an Event of Default until the Trustee or the
Securityholders of at least 25% in aggregate principal amount of the outstanding Securities notify
the Company or the Company and the Trustee, respectively, of the Default and the Company does not
cure such Default within the time specified after receipt of such notice. Such notice must specify
the Default, demand that it be remedied and state that such notice is a “Notice of Default.” When
any Default under this Section 6.01 is cured in accordance herewith, it shall cease to be a
Default.

     The Company shall deliver to the Trustee, promptly upon becoming aware of any Default, written
notice in the form of an Officers’ Certificate of any Default known to the party, its status and
what action the Company is taking or proposes to take with respect thereto.

     Section 6.02. Acceleration. If an Event of Default (other than an Event of Default specified
in Section 6.01(h) or Section 6.01(i) with respect to the Company) occurs and is continuing, the
Trustee by notice to the Company, or the Securityholders of at least 25% in principal amount of the
outstanding Securities
by notice to the Company and the Trustee, may declare the principal of and accrued but unpaid
interest on all the Securities to be due and payable. Upon such a declaration, such principal and
interest shall be due and payable immediately. If an Event of Default specified in Section 6.01(h)
or Section 6.01(i) with respect to the Company occurs, the principal of and interest on all the
Securities shall ipso facto become and be immediately due and payable without any declaration or
other act on the part of the Trustee or any Securityholders. The Securityholders of a majority in
principal amount of the Securities by notice to the Trustee may rescind an acceleration and its
consequences if the rescission would not conflict with any judgment or decree and if (i) the
Company has paid (or deposited with the Trustee) all overdue interest on all the Securities and the
principal amount of the Securities that has become due otherwise than by such acceleration or
declaration, as well as paid interest upon overdue interest to the extent that payment of such
interest is lawful and paid to the Trustee any amount due to it for the reasonable compensation,
expenses, disbursements and advances of the Trustee, its agents and its counsel, and (ii) all
existing Events of Default have been cured or waived except nonpayment of principal or interest
that has become due solely because of acceleration. No such rescission shall affect any subsequent
Default or impair any right consequent thereto.

     Section 6.03. Other Remedies. If an Event of Default occurs and is continuing, and the
principal of and accrued but unpaid interest on the Securities has been declared due and payable as
provided in Section 6.02 the Trustee may pursue any available remedy to collect the payment of
principal of or interest on the Securities or to enforce the performance of any provision of the
Securities or this Indenture.

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     The Trustee may maintain a proceeding even if it does not possess any of the Securities or
does not produce any of them in the proceeding. A delay or omission by the Trustee or any
Securityholder in exercising any right or remedy accruing upon an Event of Default shall not impair
the right or remedy or constitute a waiver of or acquiescence in the Event of Default. No remedy
is exclusive of any other remedy. All available remedies are cumulative.

     Section 6.04. Waiver of Defaults and Events of Default. The Holders of a majority in
principal amount of the Securities outstanding by notice to the Trustee may on behalf of the
holders of all the Securities, waive any Default or Event of Default and its consequences except
(i) a default in the payment of the principal of or interest on a Security when due, (ii) an Event
of Default arising from the failure to redeem or repurchase any Security when required pursuant to
the terms of this Indenture, (iii) an Event of Default arising from the failure of the Company to
deliver Common Stock (including any Additional Shares), cash and, if applicable shares of or a
combination of the foregoing, as applicable upon the conversion of any Securities pursuant to the
terms of this Indenture or (iv) a default in respect of a provision that under Section 9.02 cannot
be amended without the consent of each Securityholder affected. When an Event of Default is
waived, it is deemed cured, but no such waiver shall extend to any subsequent or other Event
of Default or impair any consequent right.

     Section 6.05. Control by Majority. The Securityholders of a majority in aggregate principal
amount of the outstanding Securities may direct the time, method and place of conducting any
proceeding for any remedy available to the Trustee or of exercising any trust or power conferred on
the Trustee. However, the Trustee may refuse to follow any direction that conflicts with law or
this Indenture or, subject to Section 7.01, that the Trustee determines is unduly prejudicial to
the rights of other Securityholders or would involve the Trustee in personal liability; provided
that the Trustee may take any other action deemed proper by the Trustee that is not inconsistent
with such direction. Prior to taking any action hereunder, the Trustee shall be entitled to
indemnification satisfactory to it in its sole discretion against all losses and expenses caused by
taking or not taking such action.

     Section 6.06. Limitation on Suits. Except to enforce the right to receive payment of
principal or interest when due, no Securityholder may pursue any remedy with respect to this
Indenture or the Securities unless:

     (a) the Securityholder gives to the Trustee written notice stating that an Event of Default is
continuing;

     (b) the Securityholders of at least 25% in principal amount of the Securities make a written
request to the Trustee to pursue the remedy;

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     (c) such Securityholder or Securityholders offer to the Trustee reasonable security or
indemnity against any loss, liability or expense of the Trustee;

     (d) the Trustee does not comply with the request within 60 days after receipt of the request
and the offer of indemnity; and

     (e) the Securityholders of a majority in principal amount of the Securities do not give the
Trustee a direction inconsistent with the request.

     A Securityholder may not use this Indenture to prejudice the rights of another Securityholder
or to obtain a preference or priority over another Securityholder.

     Anything contained in this Indenture or the Securities to the contrary notwithstanding, the
Holder of any Securities, without the consent of either the Trustee or the Holder of any other
Securities, on its own behalf and for its own benefit, may enforce, and may institute and maintain
any proceeding suitable to enforce, its rights of conversion as provided herein.

     Section 6.07. Rights of Securityholders to Receive Payment. Notwithstanding any other
provision of this Indenture, the right of any Securityholder to receive payment of the principal of
(including the Redemption Price, Fundamental Change Repurchase Price or Repurchase Price) and
accrued interest on the Securities held by such Securityholder, or delivery of the cash and, if
applicable, shares of Common Stock issuable upon conversion of the Securities, on or after the
respective due dates expressed in the Securities, or to bring suit for the enforcement of any such
payment or delivery on or after such respective dates, shall not be impaired or affected without
the consent of such Securityholder.

     Section 6.08. Collection Suit by Trustee. If an Event of Default specified in Section
6.01(a) or 6.01(b) occurs and is continuing, the Trustee may recover judgment in its own name and
as trustee of an express trust against the Company for the whole amount then due and owing
(together with interest on any unpaid interest to the extent lawful) and the amounts provided for
in Section 7.07.

     Section 6.09. Trustee May File Proofs of Claim. The Trustee may file such proofs of claim
and other papers or documents as may be necessary or advisable in order to have the claims of the
Trustee and the Securityholders allowed in any judicial proceedings relative to the Company, their
creditors or their property and, unless prohibited by law or applicable regulations, may vote on
behalf of the Securityholders in any election of a trustee in bankruptcy or other Person performing
similar functions, and any Custodian in any such judicial proceeding is hereby authorized by each
Securityholder to make payments to the

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Trustee and, in the event that the Trustee shall consent to
the making of such payments directly to the Securityholders, to pay to the Trustee any amount due
it for the reasonable compensation, expenses, disbursements and advances of the Trustee, its agents
and its counsel, and any other amounts due the Trustee under Section 7.07.

     Section 6.10. Priorities. If the Trustee collects any money or property pursuant to this
Article 6, it shall pay out the money or property in the following order:

     FIRST: to the Trustee for amounts due under Section 7.07;

     SECOND: to Securityholders for amounts due and unpaid on the Securities for principal and
interest, ratably without preference or priority of any kind, according to the amounts due and
payable on the Securities for principal and interest, respectively; and

     THIRD: to the Company.

The Trustee may fix a record date and payment date for any payment to Securityholders pursuant to
this Section. At least 15 days before such record date,
the Trustee shall mail to each Securityholder and the Company a notice that states the record date,
the payment date and amount to be paid.

     Section 6.11. Undertaking for Costs. In any suit for the enforcement of any right or remedy
under this Indenture or in any suit against the Trustee for any action taken or omitted by it as
Trustee, a court in its discretion may require the filing by any party litigant in the suit of an
undertaking to pay the costs of the suit, and the court in its discretion may assess reasonable
costs, including reasonable attorneys’ fees, against any party litigant in the suit, having due
regard to the merits and good faith of the claims or defenses made by the party litigant. This
Section does not apply to a suit by the Trustee, a suit by a Securityholder pursuant to Section
6.07 or a suit by Securityholders of more than 10% in principal amount of the Securities or to any
suit instituted by any Holder of Securities for the enforcement of the payment of the principal of
or interest on any Securities on or after the due date expressed in such Securities or to any suit
for the enforcement of the right to convert any Securities in accordance with the provisions of
Article 10.

     Section 6.12. Waiver of Stay, Extension or Usury Laws. The Company (to the extent it may
lawfully do so) shall not at any time insist upon, or plead, or in any manner whatsoever claim or
take the benefit or advantage of, any stay, extension or usury law wherever enacted, now or at any
time hereafter in force, which may affect the covenants or the performance of this Indenture;
and
the

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Company (to the extent that it may lawfully do so) hereby expressly waives all benefit or
advantage of any such law, and shall not hinder, delay or impede the execution of any power herein
granted to the Trustee, but shall suffer and permit the execution of every such power as though no
such law had been enacted.

     Section 6.13. Alternative Remedy for Failure to Comply with Reporting Obligations in the
Indenture and TIA. Notwithstanding any other provision of this Article 6, if the Company so
elects, the sole remedy for an Event of Default relating to the failure to comply with Section 4.08
of this Indenture and/or for any failure to comply with the requirements of Section 314(a)(1) of
the Trust Indenture Act will, for the 365 days after the occurrence of such an Event of Default,
consist exclusively of the right to receive additional interest (the “Default Additional Interest”)
on the Securities at an annual rate equal to 1.00% of the principal amount of the Securities then
outstanding. In the event the Company does not elect to pay the Default Additional Interest upon an
Event of Default in accordance with this Section 6.13, the Securities will be subject to
acceleration as provided above. The Default Additional Interest will accrue on all outstanding
Securities from and including the date on which an Event of Default relating to a failure to comply
with Section 4.08 of this Indenture and/or for any failure to comply with the requirements of
Section 314(a)(1) of the Trust Indenture Act first occurs to, but not including, the 365th day
thereafter (or such earlier date on which the Event of Default relating to such failure shall have
been cured or waived prior to such 365th day) and will be payable in the same manner
as the Registration Rights Additional Interest. On such 365th day (or earlier, if the Event
of Default relating to such failure is cured or waived prior to such 365th day) such Default
Additional Interest will cease to accrue and the Securities will be subject to acceleration as
provided above if the Event of Default is continuing. In no event will Additional Interest accrue
at a rate in excess of 1.00% per annum pursuant to this Indenture and the Registration Rights
Agreement, regardless of the number of events or circumstances giving rise to the requirement to
pay the Additional Interest. This provision will not affect the rights of holders of Securities in
the event of the occurrence of any other Event of Default.

ARTICLE 7

Trustee

     Section 7.01. Duties of Trustee. (a) If an Event of Default has occurred and is continuing,
the Trustee shall exercise the rights and powers vested in it by this Indenture and use the same
degree of care and skill in its exercise as a prudent Person would exercise or use under the
circumstances in the conduct of such Person’s own affairs.

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     (b) Except during the continuance of an Event of Default:

     (i) the Trustee need only perform such duties as are specifically set forth in this
Indenture and no implied covenants or obligations shall be read into this Indenture
against the Trustee; and

     (ii) in the absence of bad faith on its part, the Trustee may conclusively rely, as
to the truth of the statements and the correctness of the opinions expressed therein, upon
certificates or opinions furnished to the Trustee and conforming to the requirements of
this Indenture. However, the Trustee shall examine the certificates and opinions to
determine whether or not they conform to the requirements of this Indenture.

     (c) The Trustee may not be relieved from liability for its own negligent action, its own
negligent failure to act or its own willful misconduct, except that:

     (i) this paragraph does not limit the effect of paragraph (b) of this Section;

     (ii) the Trustee shall not be liable for any error of judgment made in good faith by
a Trust Officer unless it is proved that the Trustee was negligent in ascertaining the
pertinent facts; and

     (iii) the Trustee shall not be liable with respect to any action it takes or omits to
take in good faith in accordance with a direction received by it pursuant to Section 6.05.

     (d) Every provision of this Indenture that in any way relates to the Trustee is subject to
paragraphs (a), (b) and (c) of this Section.

     (e) The Trustee shall not be liable for interest on any money received by it except as the
Trustee may agree in writing with the Company.

     (f) Money held in trust by the Trustee need not be segregated from other funds except to the
extent required by law.

     (g) No provision of this Indenture shall require the Trustee to expend or risk its own funds
or otherwise incur financial liability in the performance of any of its duties hereunder or in the
exercise of any of its rights or powers, if it shall have reasonable grounds to believe that
repayment of such funds or adequate indemnity against such risk or liability is not reasonably
assured to it.

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     (h) Every provision of this Indenture relating to the conduct or affecting the liability of or
affording protection to the Trustee shall be subject to the provisions of this Section and to the
provisions of the TIA.

     Section 7.02. Rights of Trustee. (a) The Trustee may rely on any document believed by it to
be genuine and to have been signed or presented by the proper person. The Trustee need not
investigate any fact or matter stated in the document.

     (b) Before the Trustee acts or refrains from acting, it may require an Officers’ Certificate
or an Opinion of Counsel. The Trustee shall not be liable for any action it takes or omits to take
in good faith in reliance on the Officers’ Certificate or Opinion of Counsel.

     (c) The Trustee may act through agents and shall not be responsible for the misconduct or
negligence of any agent appointed with due care.

     (d) The Trustee shall not be liable for any action it takes or omits to take in good faith
which it believes to be authorized or within its rights or powers.

     (e) The Trustee may consult with counsel, and the advice or opinion of counsel with respect to
legal matters relating to this Indenture and the Securities shall be full and complete
authorization and protection from liability in respect to any action taken, omitted or suffered by
it hereunder in good faith and in accordance with the advice or opinion of such counsel.

     (f) The Trustee shall not be bound to make any investigation into the facts or matters stated
in any resolution, certificate, statement, instrument, opinion,
report, notice, request, consent, order, approval, bond, note, debenture, other paper or
document, but the Trustee, in its discretion, may make such further inquiry or investigation into
such facts or matters as it may see fit.

     (g) The Trustee shall be under no obligation to exercise any of the rights or powers vested in
it by this Indenture at the request, order or direction of any of the Securityholders pursuant to
the provisions of this Indenture, unless such Securityholders shall have offered to the Trustee
reasonable security or indemnity against the costs, expenses and liabilities which may be incurred
therein or thereby.

     Section 7.03. Individual Rights of Trustee. The Trustee in its individual or any other
capacity may become the owner or pledgee of Securities and may otherwise deal with the Company or
its Affiliates with the same rights it would have if it were not Trustee. Any Conversion Agent,
Paying Agent, Registrar or

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co-paying agent may do the same with like rights. However, the Trustee
must comply with Sections 7.10 and 7.11.

     Section 7.04. Trustee’s Disclaimer. The Trustee shall not be responsible for and makes no
representation as to the validity or adequacy of this Indenture or the Securities, it shall not be
accountable for the Company’s use of the proceeds from the Securities, and it shall not be
responsible for any statement of the Company in this Indenture or in any document issued in
connection with the sale of the Securities or in the Securities other than the Trustee’s
certificate of authentication.

     Section 7.05. Notice of Defaults. (a) The Trustee shall not be deemed to have notice of any
Default, other than a payment default, unless a Trust Officer shall have been advised in writing
that a Default has occurred. No duty imposed upon the Trustee in this Indenture shall be
applicable with respect to any Default of which the Trustee is not deemed to have notice.

     (b) If a default occurs and is continuing and if it is known to the Trustee, the Trustee shall
mail to each Securityholder notice of the default within the earlier of 90 days after it occurs or
30 days after it is known to a Trust Officer or written notice of it is received by the Trustee.
Except in the case of a default in payment of principal or interest on any Security (including
payments pursuant to the redemption or repurchase provisions of such Security), the Trustee may
withhold notice if and so long as a committee of its Trust Officers in good faith determines that
withholding notice is in the interests of the Securityholders.

     Section 7.06. Reports by Trustee to Securityholders. As promptly as practicable, beginning
with the May 15 following the first anniversary of the date of this Indenture, and in any event
prior to May 15 in each subsequent year, the Trustee shall, to the extent that any of the events
described in TIA § 313(a) occurred within the previous twelve months, but not otherwise, mail to
each
Securityholder a brief report dated as of May 15 that complies with Section 313(a) of the TIA.
The Trustee shall also comply with Section 313(b) of the TIA.

     A copy of each report at the time of its mailing to Securityholders shall be filed with the
SEC and each stock exchange (if any) on which the Securities are listed. The Company agrees to
promptly notify the Trustee whenever the Securities become listed on any stock exchange and of any
delisting thereof.

     Section 7.07. Compensation and Indemnity. The Company shall pay to the Trustee from time to
time such compensation as the Company and the Trustee shall from time to time agree in writing.
The Trustee’s compensation shall not be limited by any law on compensation of a trustee of an
express trust. The Company shall reimburse the Trustee upon request for all reasonable
out-of-

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pocket expenses incurred or made by it, including costs of collection, in addition to the
compensation for its services. Such expenses shall include the reasonable compensation and
expenses, disbursements and advances of the Trustee’s agents, counsel, accountants and experts.
The Company shall indemnify the Trustee, and hold it harmless, against any and all loss, liability
or expense (including reasonable attorneys’ fees) incurred by or in connection with the offer and
sale of the Securities or the administration of this trust and the performance of its duties
hereunder. The Trustee shall notify the Company of any claim for which it may seek indemnity
promptly upon obtaining actual knowledge thereof; provided that any failure so to notify the
Company shall not relieve the Company of its indemnity obligations hereunder. The Company shall
defend the claim and the indemnified party shall provide reasonable cooperation at the Company’s
expense in the defense. Such indemnified parties may have separate counsel and the Company shall
pay the fees and expenses of such counsel; provided that the Company shall not be required to pay
such fees and expenses if it assumes such indemnified parties’ defense and, in such indemnified
parties’ reasonable judgment, there is no conflict of interest between the Company and such parties
in connection with such defense. The Company need not reimburse any expense or indemnify against
any loss, liability or expense incurred by an indemnified party through such party’s own willful
misconduct and negligence.

     To secure the Company’s payment obligations in this Section, the Trustee shall have a lien
prior to the Securities on all money or property held or collected by the Trustee other than money
or property held in trust to pay principal of and interest and any liquidated damages on particular
Securities.

     The Company’s payment obligations pursuant to this Section shall survive the satisfaction or
discharge of this Indenture, any rejection or termination of this Indenture under any bankruptcy
law or the resignation or removal of the Trustee. When the Trustee incurs expenses after the
occurrence of an Event of Default specified in Section 6.01(h) or 6.01(i) with respect to the
Company, the expenses are intended to constitute expenses of administration under the Bankruptcy
Law.

     Section 7.08. Replacement of Trustee. The Trustee may resign at any time by so notifying the
Company. The Holders of a majority in principal amount of the Securities may remove the Trustee by
so notifying the Trustee and may appoint a successor Trustee. The Company shall remove the Trustee
if:

     (a) the Trustee fails to comply with Section 7.10;

     (b) the Trustee is adjudged bankrupt or insolvent;

     (c) a receiver or other public officer takes charge of the Trustee or its property; or

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     (d) the Trustee otherwise becomes incapable of acting.

     If the Trustee resigns, is removed by the Company or by the Holders of a majority in principal
amount of the Securities and such Securityholders do not reasonably promptly appoint a successor
Trustee, or if a vacancy exists in the office of Trustee for any reason (the Trustee in such event
being referred to herein as the retiring Trustee), the Company shall promptly appoint a successor
Trustee.

     A successor Trustee shall deliver a written acceptance of its appointment to the retiring
Trustee and to the Company. Thereupon the resignation or removal of the retiring Trustee shall
become effective, and the successor Trustee shall have all the rights, powers and duties of the
Trustee under this Indenture. The successor Trustee shall mail a notice of its succession to
Securityholders. The retiring Trustee shall promptly transfer all property held by it as Trustee
to the successor Trustee, subject to the lien provided for in Section 7.07.

     If a successor Trustee does not take office within 60 days after the retiring Trustee resigns
or is removed, the retiring Trustee or the Holders of 10% in principal amount of the Securities may
petition any court of competent jurisdiction for the appointment of a successor Trustee.

     If the Trustee fails to comply with Section 7.10, any Securityholder may petition any court of
competent jurisdiction for the removal of the Trustee and the appointment of a successor Trustee.

     Notwithstanding the replacement of the Trustee pursuant to this Section, the Company’s
obligations under Section 7.07 shall continue for the benefit of the retiring Trustee.

     Section 7.09. Successor Trustee by Merger. If the Trustee consolidates with, merges or
converts into, or transfers all or substantially all of its corporate trust business or assets to,
another corporation or banking association, the resulting, surviving or transferee corporation
without any further act shall be the successor Trustee.

     In case at the time such successor or successors by merger, conversion or consolidation to the
Trustee shall succeed to the trusts created by this Indenture any of the Securities shall have been
authenticated but not delivered, any such successor to the Trustee may adopt the certificate of
authentication of any predecessor trustee, and deliver such Securities so authenticated; and in
case at that time any of the Securities shall not have been authenticated, any successor to the
Trustee may authenticate such Securities either in the name of any predecessor hereunder or in the
name of the successor to the Trustee; and in all such cases

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such certificates shall have the full
force which it is anywhere in the Securities or in this Indenture provided that the certificate of
the Trustee shall have.

     Section 7.10. Eligibility; Disqualification. The Trustee shall at all times satisfy the
requirements of TIA § 310(a). The Trustee shall have a combined capital and surplus of at least
$100,000,000 as set forth in its most recent published annual report of condition. The Trustee
shall comply with TIA § 310(b); provided that there shall be excluded from the operation of TIA §
310(b)(1) any indenture or indentures under which other securities or certificates of interest or
participation in other securities of the Company are outstanding if the requirements for such
exclusion set forth in TIA § 310(b)(1) are met.

     Section 7.11. Preferential Collection of Claims Against Company. The Trustee shall comply
with TIA § 311(a), excluding any creditor relationship listed in TIA § 311(b). A Trustee who has
resigned or been removed shall be subject to TIA § 311(a) to the extent indicated.

ARTICLE 8

Discharge of Indenture

     Section 8.01. Discharge of Liability on Securities. (a) At any time after all outstanding
Securities have become due and payable, whether at maturity or as a result of the mailing of a
notice of redemption or upon a repurchase pursuant to Article 3 hereof, and any pending conversions
have been completed (including delivery of all cash and shares of Common Stock, if any, deliverable
pursuant to such conversions in accordance with Section 10.13) then this Indenture shall, subject
to Section 8.01(b), cease to be of further effect when (i) the Company delivers to the Trustee all
outstanding Securities (other than Securities replaced pursuant to Section 2.12) for cancellation
or (ii) the Company irrevocably deposits with the Trustee money sufficient to pay at maturity or
upon redemption or repurchase all outstanding Securities, including interest thereon to but
excluding, maturity or such redemption or repurchase date (other than Securities replaced pursuant
to Section 2.12), and if in each such case the Company pays all other sums payable hereunder by the
Company. The Trustee shall acknowledge satisfaction and discharge of this Indenture on demand of
the Company
accompanied by an Officers’ Certificate and an Opinion of Counsel and at the cost and expense
of the Company.

     (b) Notwithstanding clause (a) above, the Company’s obligations in Sections 2.05, 2.06, 2.07,
2.08, 2.09, 2.10, 2.12, 2.13, 7.07, 7.08 and in this Article 8 shall survive until the Securities
have been paid in full. Thereafter, the Company’s obligations in Sections 7.07, 8.03 and 8.04
shall survive.

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     Section 8.02. Application of Trust Money. The Trustee shall hold in trust money deposited
with it pursuant to this Article 8. It shall apply the deposited money through the Paying Agent
and in accordance with this Indenture to the payment of principal of and interest on the Securities
in accordance with this Indenture in relation to the conversion of Securities pursuant to the terms
hereof.

     Section 8.03. Repayment to Company. The Trustee and the Paying Agent shall promptly turn
over to the Company upon request any excess money or securities held by them at any time.

     Subject to any applicable abandoned property law, the Trustee and the Paying Agent shall pay
to the Company upon written request any money held by them for the payment of principal or interest
that remains unclaimed for two years, and, thereafter, Securityholders entitled to the money and/or
securities must look to the Company for payment as general creditors.

     Section 8.04. Reinstatement. If the Trustee or Paying Agent is unable to apply any money in
accordance with this Article 8 by reason of any legal proceeding or by reason of any order or
judgment of any court or governmental authority enjoining, restraining or otherwise prohibiting
such application, the Company’s obligations under this Indenture and the Securities shall be
revived and reinstated as though no deposit had occurred pursuant to this Article 8 until such time
as the Trustee or Paying Agent is permitted to apply all such money in accordance with this Article
8; provided that, if the Company has made any payment of interest on or principal of any Securities
because of the reinstatement of its obligations, the Company shall be subrogated to the rights of
the Securityholders of such Securities to receive such payment from the money held by the Trustee
or Paying Agent.

ARTICLE 9

Amendments

     Section 9.01. Without Consent of Securityholders. The Company and the Trustee may amend this
Indenture or the Securities without notice to or consent of any Securityholder:

     (a) to provide for conversion rights of Holders of the Securities and the Company’s repurchase
obligations in connection with a Fundamental Change in the event of any reclassification of Common
Stock, merger or consolidation, or sale, conveyance, transfer or lease of the Company’s property
and assets substantially as an entirety;

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     (b) to secure the Securities including provisions regarding the circumstances under which
collateral may be released or substituted;

     (c) evidence the succession of another Person to the Company under the terms of this Indenture
or successive successions, and provide for the assumption of the Company’s obligations to the
Holders in the event of a merger or consolidation, or sale, conveyance, transfer or lease of the
Company’s property and assets substantially as an entirety;

     (d) to surrender any right or power conferred upon the Company;

     (e) to add to the covenants of the Company for the benefit of the Securityholders;

     (f) to cure any ambiguity or correct or supplement any inconsistency or defective provision
contained in this Indenture; provided that such modification or amendment does not adversely affect
the interests of the Holders of the Securities in any material respect; provided, further, that any
amendment made solely to conform the provisions of this Indenture to the description of the
Securities contained in the Offering Memorandum prepared by the Company dated as of August 7, 2007
will not be deemed to adversely affect the interests of the Holders of the Securities;

     (g) to make any provision with respect to matters or questions arising under this Indenture
that the Company may deem necessary or desirable and that shall not be inconsistent with provisions
of this Indenture; provided that such change or modification does not, in the good faith opinion of
the Board of Directors, adversely affect the interests of the Holders of the Securities in any
material respect;

     (h) to increase the Conversion Rate in accordance with this Indenture;

     (i) to comply with any requirements of the SEC in connection with qualifying, or maintaining
the qualification of, this Indenture under the TIA;

     (j) to add or provide for the guarantee of obligations under the Securities or additional
obligors on the Securities;

     (k) to make any changes or modifications necessary in connection with the registration of the
Securities under the Securities Act as contemplated by the
Registration Rights Agreement; provided that such change or modification does not adversely
affect the interests of the Holders of the Securities in any material respect; or

     (l) to provide for a successor Trustee.

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     After an amendment under this Section becomes effective, the Company shall mail to
Securityholders a notice briefly describing such amendment. The failure to give such notice to all
Securityholders, or any defect therein, shall not impair or affect the validity of an amendment
under this Section.

     Section 9.02. With Consent of Securityholders. The Company and the Trustee may amend this
Indenture or the Securities with the written consent or affirmative vote of the Holders of at least
a majority in principal amount of the Securities then outstanding (including consents obtained in
connection with a tender offer or exchange offer for the Securities), without notice to any other
Securityholder. However, without the consent of each Holder of an outstanding Security affected,
an amendment may not:

     (a) extend the Maturity Date;

     (b) reduce the rate of or extend the time for payment of interest on any Security;

     (c) reduce the principal amount of any Security;

     (d) reduce any amount payable upon redemption or repurchase of any Security;

     (e) impair the right of a Holder to institute suit for payment of any Securities;

     (f) make any Security payable in a currency other than that stated in the Security;

     (g) change the obligation of the Company to redeem any Security called for redemption in a
manner adverse to the Holders;

     (h) change the obligation of the Company to repurchase any Security at the option of the
Holder or upon a Fundamental Change in a manner adverse to the Holders;

     (i) except as required by this Indenture, adversely affect the right of a Holder to convert
any Securities into cash and, if applicable, shares of Common Stock (or to the extent otherwise
applicable, other property, including cash, receivable upon conversion pursuant to the terms of
this Indenture) or reduce the Conversion Rate, except as otherwise permitted pursuant to this
Indenture; or

     (j) make any changes in Section 6.04 or 6.07, the first sentence of this Section 9.02
regarding the percentage of the Securities required for consent or any

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modification of this
Indenture that does not require the consent of each affected Holder or the second sentence of this
Section 9.02.

     It shall not be necessary for the consent of the Securityholders under this Section to approve
the particular form of any proposed amendment, but it shall be sufficient if such consent approves
the substance thereof.

     After an amendment under this Section becomes effective, the Company shall mail to
Securityholders a notice briefly describing such amendment. The failure to give such notice to all
Securityholders, or any defect therein, shall not impair or affect the validity of an amendment
under this Section.

     Section 9.03. Compliance with Trust Indenture Act. Every amendment to this Indenture or the
Securities shall comply with the TIA as then in effect.

     Section 9.04. Revocation and Effect of Consents and Waivers. A consent to an amendment or a
waiver by a Securityholder of a Security shall bind the Securityholder and every subsequent
Securityholder of that Security or portion of the Security that evidences the same debt as the
consenting Securityholder’s Security, even if notation of the consent or waiver is not made on the
Security. However, any such Securityholder or subsequent Securityholder may revoke the consent or
waiver as to such Securityholder’s Security or portion of the Security if the Trustee receives the
notice of revocation before the date the amendment or waiver becomes effective. After an amendment
or waiver becomes effective, it shall bind every Securityholder. An amendment or waiver becomes
effective once (i) the requisite number of consents have been received by the Company or the
Trustee and (ii) in the case of an amendment, such amendment has been executed by the Company and
the Trustee.

     The Company may, but shall not be obligated to, fix a record date for the purpose of
determining the Securityholders entitled to give their consent or take any other action described
above or required or permitted to be taken pursuant to this Indenture. If a record date is fixed,
then notwithstanding the immediately preceding paragraph, those Persons who were Securityholders at
such record date (or their duly designated proxies), and only those Persons, shall be entitled to
give such consent or to revoke any consent previously given or to take any such action, whether or
not such Persons continue to be Securityholders after such record date. No consent shall be valid
or effective for more than 120 days after such record date unless consents from holders of the
principal amount of Securities required hereunder to give such consent or take such action shall
have also been given and not revoked within such 120-day period.

     Section 9.05. Notation on or Exchange of Securities. If an amendment changes the terms of a
Security, the Trustee may require the Securityholder of the

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Security to deliver it to the Trustee. The Trustee may place an appropriate notation on the
Security regarding the changed terms and return it to the Securityholder. Alternatively, if the
Company or the Trustee so determines, the Company in exchange for the Security shall issue and the
Trustee shall authenticate a new Security that reflects the changed terms. Failure to make the
appropriate notation or to issue a new Security shall not affect the validity of such amendment.

     Section 9.06. Trustee to Sign Amendments. The Trustee shall sign any amendment authorized
pursuant to this Article 9 if the amendment does not adversely affect the rights, duties,
liabilities or immunities of the Trustee. If it does, the Trustee may but need not sign it. In
signing such amendment the Trustee shall be entitled to receive indemnity reasonably satisfactory
to it and to receive, and (subject to Section 7.01) shall be fully protected in relying upon, an
Officers’ Certificate and an Opinion of Counsel stating that such amendment is authorized or
permitted by this Indenture and that such amendment is the legal, valid and binding obligation of
the Company enforceable against them in accordance with its terms, subject to customary exceptions,
and complies with the provisions hereof (including Section 9.03).

ARTICLE 10

Conversion of Securities

     Section 10.01. Right to Convert. (a) Subject to and upon compliance with the provisions of
this Indenture, on or prior to the close of business on the Business Day immediately preceding
August 15, 2027, the Holder of any Securities not previously redeemed or repurchased shall have the
right, at such Holder’s option, to convert the principal amount of the Securities held by such
Holder, or any portion of such principal amount which is an integral multiple of $1,000, into cash
and, if applicable, fully paid and non-assessable shares of Common Stock (as such shares shall then
be constituted) as described in Section 10.13, at the Conversion Rate in effect at such time, by
surrender of the Securities so to be converted in whole or in part, together with any required
funds, under the circumstances described in this Section 10.01 and in the manner provided in
Section 10.02. The Securities shall be convertible only upon the occurrence of one of the
following events:

     (i) prior to February 15, 2027, on any date during any Fiscal Quarter beginning after
September 30, 2007 (and only during such Fiscal Quarter), if the Closing Sale Price of a
share of Common Stock was more than 120% of the then current Conversion Price for at least
20 Trading

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Days in the period of 30 consecutive Trading Days ending on the last Trading
Day of the previous Fiscal Quarter;

     (ii) at any time on or after February 15, 2027;

     (iii) with respect to any Securities called for redemption pursuant to Section 3.01,
until the close of business on the Business Day prior to the relevant Redemption Date;

     (iv) if the Company distributes to all or substantially all holders of Common Stock,
rights or warrants entitling them to purchase, for a period of 45 calendar days or less,
Common Stock at a price less than the average Closing Sale Price per share of the Common
Stock for the ten Trading Days preceding the declaration date for such distribution;

     (v) if the Company distributes to all or substantially all holders of Common Stock,
cash or other assets, debt securities or rights to purchase the Company’s securities,
which distribution has a per share value exceeding 10% of the Closing Sale Price per share
of the Common Stock on the Trading Day preceding the declaration date for such
distribution;

     (vi) if the Company consolidates with or merges with or into another Person or is a
party to a binding share exchange or conveys, transfers, sells, leases or otherwise
disposes of all or substantially all of its properties and assets in each case in a
transaction not constituting a Fundamental Change, pursuant to which the Common Stock
would be converted into cash, securities and/or other property, at any time beginning 15
calendar days prior to the date announced by the Company as the anticipated effective date
of the transaction and until and including the date which is 15 calendar days after the
date that is the actual effective date of such transaction;

     (vii) if a Fundamental Change occurs, at any time beginning on the Business Day
following the effective date of the Fundamental Change until 5:00 p.m., New York City
time, on the Business Day preceding the Fundamental Change Repurchase Date relating to
such Fundamental Change; or

     (viii) during the five consecutive Business Day period immediately following any five
consecutive Trading Day period in which the Trading Price for $1,000 principal amount of
the Securities for each day during such five Trading Day period was less than 98% of the
Closing

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Sale Price of a share of Common Stock and multiplied by the then applicable
Conversion Rate.

     (b) (i) The Company shall notify the Trustee in writing on or prior to the fifth Business Day
following the first day of each Fiscal Quarter (commencing prior to February 15, 2027, beginning
with the Fiscal Quarter ending December
31, 2007) if the condition to conversion set forth in Section 10.01(a) above shall have been
satisfied with respect to such Fiscal Quarter.

     (ii) The Trustee shall have no obligation to determine the Trading Price of the Securities and
whether the Securities are convertible pursuant to clause (viii) of Section 10.01(a) unless the
Company has requested in writing such determination; and the Company shall have no obligation to
make such request unless a Holder of the Securities provides the Company with reasonable written
evidence that the Trading Price of $1,000 principal amount of the Securities would be less than 98%
of the product of the Closing Sale Price of the Common Stock and the then current Conversion Rate
and requests that the Company requests such determination from the Trustee. At such time, the
Company shall instruct the Trustee to, and the Trustee shall, determine the Trading Price of the
Securities beginning on the next Trading Day and for each following Trading Day until the minimum
Trading Price threshold is exceeded.

     The Trustee shall be entitled at its sole discretion to consult with the Company and to
request the assistance of the Company in connection with the Trustee’s duties and obligations
pursuant to this Section 10.01(b)(ii) (including without limitation the calculation or
determination of the Closing Sale Price and the Trading Price), and the Company shall, if requested
by the Trustee, cooperate with, and provide assistance to, the Trustee in carrying out its duties
under this Section 10.01(b)(ii). Upon determination of the Closing Sale Price and the Trading
Price, the Trustee shall notify the Company in writing of such determination.

     (c) In the case of a distribution contemplated by clauses (iv) or (v) of Section 10.01(a), the
Company shall notify Holders of Securities at least 25 Scheduled Trading Days prior to the Ex-Date
for such distribution (the “Distribution Notice”). Once the Company has given the Distribution
Notice, Holders may surrender their Securities for conversion at any time until the earlier of (i)
5:00 p.m., New York City time, on the Business Day immediately preceding the Ex-Date or (ii) the
Company’s announcement that such distribution will not take place. In the event of a distribution
contemplated by clauses (iv) or (v) of Section 10.01(a), Holders may not convert the Securities if
the Holders may otherwise participate in such distribution without converting their Securities at
the same time that holders of Common Stock participate as if the Holder had held a

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number of shares
of Common Stock equal to the Conversion Rate multiplied by the principal amount (expressed in
thousands) of the Securities held by the Holder.

     (d) Whenever the Securities shall become convertible pursuant to this Section 10.01, the
Company or, at the Company’s request, the Trustee in the name and at the expense of the Company,
shall notify the Holders of the event triggering such convertibility in the manner provided in
Section 11.02, and the Company shall also publicly announce such information and publish it on the
Company’s website or through another public medium that the Company may use. Any notice so given shall be conclusively presumed to have been duly given, whether or not the
Holder receives such notice. The Company shall notify Holders at least 10 calendar days prior to
the anticipated effective date of any Fundamental Change.

     (e) Securities in respect of which a Holder has delivered a Fundamental Change Repurchase
Notice or a Repurchase Notice exercising such Holder’s right to require the Company to repurchase
such Securities pursuant to Section 3.04 or 3.05, as the case may be, may be converted only if such
Fundamental Change Repurchase Notice or a Repurchase Notice, as applicable, is withdrawn in
accordance with Section 3.07 prior to 5:00 p.m., New York City time, on the Business Day
immediately preceding the Fundamental Change Repurchase Date or the Repurchase Date, as applicable.

     (f) A Holder of Securities is not entitled to any rights of a Holder of Common Stock until
such holder has converted his Securities to Common Stock, and only to the extent such Securities
are deemed to have been converted to Common Stock under this Article 10.

     Section 10.02. Exercise of Conversion Right; Issuance of Common Stock on Conversion; No
Adjustment for Interest or Dividends. In order to exercise the conversion right with respect to
any Securities in certificated form, the Company must receive at the office or agency of the
Company, which will initially be the office or agency of the Trustee maintained for that purpose in
The City of New York, such Securities with the original or facsimile of the form entitled
“Conversion Notice” on the reverse thereof, duly completed and manually signed, together with such
Securities duly endorsed for transfer, together with any other required transfer documents,
accompanied by the funds, if any, required by this Section 10.02. Such notice shall also state the
name or names (with address or addresses) in which the certificate or certificates for shares of
Common Stock which shall be issuable on such conversion shall be issued, and shall be accompanied
by transfer or similar taxes, if required pursuant to Section 10.08.

     In order to exercise the conversion right with respect to any interest in a Global Security,
the Holder must complete, or cause to be completed, the

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appropriate instruction form for conversion
pursuant to the Depositary’s book-entry conversion program; deliver, or cause to be delivered, by
book-entry delivery an interest in such Global Security; furnish appropriate endorsements and
transfer documents if required by the Company or the Trustee or Conversion Agent; and pay the
funds, if any, required by this Section 10.02 and any transfer or similar taxes if required
pursuant to Section 10.08.

     After satisfaction of the requirements for conversion set forth above, the Company will
deliver cash, Common Stock or a combination of cash and Common Stock in accordance with Section
10.13. In case any Securities of a denomination greater than $1,000 shall be surrendered for
partial conversion, and
subject to Section 2.03, the Company shall execute and the Trustee shall authenticate and
deliver to the Holder of the Securities so surrendered, without charge to the Holder, a new
Security or Securities in authorized denominations in an aggregate principal amount equal to the
unconverted portion of the surrendered Securities.

     Each conversion shall be deemed to have been effected as to any such Securities (or portion
thereof) on the date on which the requirements set forth above in this Section 10.02 have been
satisfied as to such Securities (or portion thereof) (the “Conversion Date”) and such Securities
will be deemed to have been converted immediately prior to 5:00 p.m., New York City time, on the
Conversion Date. The Person in whose name any certificate or certificates for shares of Common
Stock shall be issuable upon such conversion shall be deemed to have become, on said date, the
holder of record of the shares represented thereby; provided that any such surrender on any date
when the stock transfer books of the Company shall be closed shall constitute the Person in whose
name the certificates are to be issued as the record holder thereof for all purposes on the next
succeeding day on which such stock transfer books are open.

     Any Securities or portion thereof surrendered for conversion during the period after the
Interest Record Date for any interest payment date but prior to the corresponding interest payment
date shall be accompanied by payment, in immediately available funds or other funds acceptable to
the Company, of an amount equal to the interest (excluding any Additional Interest) otherwise
payable on such interest payment date on the principal amount being converted; provided that no
such payment need be made (1) if a Holder converts its Securities in connection with a redemption
and the Company has specified a Redemption Date that is after an Interest Record Date and on or
prior to the corresponding interest payment date, (2) if a Holder converts its Securities in
connection with a Fundamental Change and the Company has specified a Fundamental Change Repurchase
Date that is after an Interest Record Date and on or prior to the corresponding interest payment
date or (3) to the extent of any overdue interest, if

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any overdue interest exists at the time of
conversion with respect to such Securities. Except as provided above in this Section 10.02 and
Section 10.06, no payment or other adjustment shall be made for interest accrued on any Securities
converted or for dividends on any shares issued upon the conversion of such Securities as provided
in this Article 10.

     Upon the conversion of an interest in a Global Security, the Trustee (or other Conversion
Agent appointed by the Company), or the custodian for the Global Security at the direction of the
Trustee (or other Conversion Agent appointed by the Company), shall make a notation on such Global
Security as to the reduction in the principal amount represented thereby. The Company shall notify
the Trustee in writing of any conversions of Securities effected through any Conversion Agent other
than the Trustee.

     Upon the conversion of any Securities, the accrued but unpaid interest attributable to the
period from the issue date of the Securities to the Conversion Date, with respect to the converted
Securities, shall not be cancelled, extinguished or forfeited, but rather shall be deemed to be
paid in full to the Holder thereof through delivery of the cash (including a cash payment in lieu
of fractional shares, if any) and shares of Common Stock, if any, in exchange for the Securities
being converted pursuant to the provisions hereof.

     Section 10.03. Cash Payments in Lieu of Fractional Shares. No fractional shares of Common
Stock or scrip certificates representing fractional shares shall be issued upon conversion of
Securities. If more than one Security shall be surrendered for conversion at one time by the same
Holder, the number of full shares that shall be issuable upon conversion shall be computed on the
basis of the aggregate principal amount of the Securities (or specified portions thereof to the
extent permitted hereby) so surrendered. If any fractional share of stock would be issuable upon
the conversion of any Security or Securities, the Company shall make an adjustment and payment
therefor in cash to the Holder of Securities at a price equal to the Closing Sale Price on the last
Trading Day of the Conversion Observation Period.

     Section 10.04. Conversion Rate. Each $1,000 principal amount of the Securities shall be
convertible into cash and/or the number of shares of Common Stock, if any, based upon the
Conversion Rate, subject to adjustment as provided in Section 10.05 and Section 10.06. The Company
shall settle its obligation to convert the Securities as provided in Section 10.13.

     Section 10.05. Adjustment to Conversion Rate upon a Non-Stock Change of Control. (a) If and
only to the extent a Holder elects to convert Securities at any time following the date on which a
Non-Stock Change of Control becomes effective (the “Effective Date”) but before 5:00 p.m., New York
City time, on the

62

 

Business Day immediately preceding the related Fundamental Change Repurchase
Date, the Company shall increase the Conversion Rate applicable to such converted Securities by a
number of additional shares of Common Stock (the “Additional Shares”) as set forth below. The
number of Additional Shares of Common Stock shall be determined by reference to the table below,
based on the Effective Date and the price (the “Stock Price”) paid per share for the Common Stock
in the Non-Stock Change of Control. If holders of Common Stock receive only cash in the Non-Stock
Change of Control, the Stock Price shall be the cash amount paid per share. Otherwise, the Stock
Price shall be the average of the Closing Sale Prices of the Common Stock on the five Trading Days
prior to but not including the Effective Date of such Non-Stock Change of Control.

     The following table sets forth the number of Additional Shares per $1,000 principal amount of
Securities by which the Conversion Rate shall be increased for conversions of Securities in
connection with a Non-Stock Change of Control
pursuant to Section 10.01(a)(vii) based on the Effective Date and Stock Price for the
Non-Stock Change of Control:

	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	 	 	Stock Price	 
	Effective Date	 	$15.89	 	 	$17.50	 	 	$20.00	 	 	$22.50	 	 	$25.00	 	 	$30.00	 	 	$35.00	 	 	$40.00	 	 	$45.00	 	 	$50.00	 	 	$55.00	 	 	$60.00	 
	August 13, 2007
	 	 	11.5591	 	 	 	9.8111	 	 	 	7.8323	 	 	 	6.4366	 	 	 	5.4129	 	 	 	4.0329	 	 	 	3.1585	 	 	 	2.5603	 	 	 	2.1267	 	 	 	1.7984	 	 	 	1.5412	 	 	 	1.3344	 
	August 15, 2008
	 	 	11.5591	 	 	 	9.6438	 	 	 	7.5671	 	 	 	6.1292	 	 	 	5.0934	 	 	 	3.7301	 	 	 	2.8909	 	 	 	2.3291	 	 	 	1.9285	 	 	 	1.6285	 	 	 	1.3952	 	 	 	1.2084	 
	August 15, 2009
	 	 	11.5591	 	 	 	9.4287	 	 	 	7.2294	 	 	 	5.7404	 	 	 	4.6920	 	 	 	3.3547	 	 	 	2.5626	 	 	 	2.0483	 	 	 	1.6895	 	 	 	1.4247	 	 	 	1.2207	 	 	 	1.0583	 
	August 15, 2010
	 	 	11.5591	 	 	 	9.1084	 	 	 	6.7634	 	 	 	5.2203	 	 	 	4.1662	 	 	 	2.8776	 	 	 	2.1547	 	 	 	1.7051	 	 	 	1.4008	 	 	 	1.1805	 	 	 	1.0127	 	 	 	0.8798	 
	August 15, 2011
	 	 	11.5591	 	 	 	8.7337	 	 	 	6.1796	 	 	 	4.5616	 	 	 	3.5026	 	 	 	2.2873	 	 	 	1.6607	 	 	 	1.2964	 	 	 	1.0609	 	 	 	0.8950	 	 	 	0.7702	 	 	 	0.6717	 
	August 15, 2012
	 	 	11.5591	 	 	 	8.1842	 	 	 	5.3390	 	 	 	3.6377	 	 	 	2.5993	 	 	 	1.5306	 	 	 	1.0579	 	 	 	0.8141	 	 	 	0.6673	 	 	 	0.5668	 	 	 	0.4915	 	 	 	0.4317	 
	August 15, 2013
	 	 	11.5591	 	 	 	7.3238	 	 	 	3.9916	 	 	 	2.2140	 	 	 	1.2882	 	 	 	0.5615	 	 	 	0.3515	 	 	 	0.2720	 	 	 	0.2284	 	 	 	0.1976	 	 	 	0.1733	 	 	 	0.1532	 
	August 20, 2014
	 	 	11.5591	 	 	 	5.7693	 	 	 	0.0000	 	 	 	0.0000	 	 	 	0.0000	 	 	 	0.0000	 	 	 	0.0000	 	 	 	0.0000	 	 	 	0.0000	 	 	 	0.0000	 	 	 	0.0000	 	 	 	0.0000	 

     (b) If the Stock Price or Effective Date for a Non-Stock Change of Control are not
set forth in the table above, then:

     (1) if the Stock Price is between two Stock Price amounts on the table or the
Effective Date is between two Effective Dates on the table, the number of Additional
Shares of Common Stock will be determined by straight-line interpolation between the
number of Additional Shares of Common Stock set forth for the higher and lower Stock Price
amounts and the two dates, as applicable, based on a 365-day year;

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     (2) if the Stock Price in excess of $60.00 per share (subject to adjustment), no
Additional Shares of Common Stock shall be issued upon conversion as set forth in Section
10.05(c); or

     (3) if the Stock Price less than $15.89 per share (subject to adjustment), no
Additional Shares of Common Stock shall be issued upon conversion as set forth in Section
10.05(c).

     Notwithstanding the foregoing, in no event will the Conversion Rate as adjusted pursuant to
this Section 10.05 exceed 62.9327 per $1,000 principal amount of the Securities.

     (c) The numbers of Additional Shares of Common Stock set forth in the table in Section
10.05(a) shall be adjusted as of any date on which the Conversion Rate is adjusted in the same
manner in which the Conversion Rate is adjusted. The Stock Prices set forth in the table in
Section 10.05(a) shall be adjusted, as of any date on which the Conversion Rate is adjusted, to
equal the Stock Price applicable immediately prior to such adjustment multiplied by a fraction, of
which:

     (1) the numerator shall be the Conversion Rate immediately prior to the adjustment;
and

     (2) the denominator shall be the Conversion Rate as so adjusted.

     (d) The Company shall provide written notice to all Holders and to the Trustee at least 20
calendar days prior to the anticipated Effective Date of a Non-Stock Change of Control.

     Section 10.06. Adjustment of Conversion Rate. The Conversion Rate shall be adjusted from
time to time by the Company, without duplication, as follows:

     (a) In case the Company shall, at any time or from time to time while any of the Securities
are outstanding, pay a dividend in shares of Common Stock or make a distribution in shares of
Common Stock to all or substantially all holders of its outstanding shares of Common Stock, then
the Conversion Rate in effect immediately prior to the opening of business on the Ex-Date for such
dividend or other distribution shall be increased by multiplying such Conversion Rate by a
fraction,

     (1) the numerator of which shall be the sum of (A) the number of shares of Common
Stock outstanding immediately prior to the opening of business on the Ex-Date for such
dividend or other distribution plus (B)

64

 

the total number of shares of Common Stock
constituting such dividend or other distribution; and

     (2) the denominator of which shall be the number of shares of Common Stock
outstanding immediately prior to the opening of business on the Ex-Date for such dividend
or other distribution,

such increase to become effective immediately after the opening of business on the Ex-Date for such
dividend or other distribution. If any dividend or distribution of the type described in this
Section 10.06(a) is declared but not so paid or made, the Conversion Rate shall again be adjusted
to the Conversion Rate that would then be in effect if such dividend or distribution had not been
declared.

     (b) In case outstanding shares of Common Stock shall be subdivided or split into a greater
number of shares of Common Stock, the Conversion Rate in effect immediately prior to the opening of
business on the effective date for such subdivision shall be proportionately increased, and
conversely, in case outstanding shares of Common Stock shall be combined into a smaller number of
shares of Common Stock, the Conversion Rate in effect immediately prior to the opening of business
on the effective date for such combination shall be proportionately reduced, such increase or
reduction, as the case may be, to
become effective immediately after the opening of business on the effective date for such
subdivision or combination.

     (c) In case the Company shall issue rights or warrants (other than any rights or warrants
referred to in Section 10.06(d)) to all or substantially all holders of its outstanding shares of
Common Stock entitling them to subscribe for or purchase, for a period of up to 45 calendar days,
shares of Common Stock at a price per share less than the Current Market Price on the declaration
date for such issuance, the Conversion Rate shall be adjusted so that the same shall equal the rate
determined by multiplying the Conversion Rate in effect immediately prior to the opening of
business on the Ex-Date for such issuance by a fraction,

     (1) the numerator of which shall be the sum of (A) the number of shares of Common
Stock outstanding immediately prior to the opening of business on the Ex-Date for such
issuance plus (B) the total number of additional shares of Common Stock offered for
subscription or purchase, and

     (2) the denominator of which is the sum of (A) the number of shares of Common Stock
outstanding immediately prior to the opening of business on the Ex-Date for such issuance
plus (B) the total number of shares that the aggregate offering price of the shares so
offered would purchase at such Current Market Price.

65

 

     Such adjustment shall be successively made whenever any such rights or warrants are
distributed, and shall become effective immediately after the opening of business on the Ex-Date
for such distribution. To the extent that shares of Common Stock are not delivered after the
expiration of such rights or warrants, the Conversion Rate shall be readjusted to the Conversion
Rate that would then be in effect had the adjustments made upon the issuance of such rights or
warrants been made on the basis of delivery of only the number of shares of Common Stock actually
delivered. If such rights or warrants are not so issued, the Conversion Rate shall again be
adjusted to be the Conversion Rate that would then be in effect if such rights or warrants had not
been issued. In determining whether any rights or warrants entitle the holders to subscribe for or
purchase shares of Common Stock at less than such Current Market Price of the Common Stock on the
declaration date for such issuance, and in determining the aggregate offering price of such shares
of Common Stock of the Common Stock on the declaration date for such issuance, there shall be taken
into account any consideration received by the Company for such rights or warrants and any amount
payable on exercise or conversion thereof, with the value of such consideration, if other than
cash, to be determined by the Board of Directors.

     (d) Except as set forth in Section 10.06(b), in case the Company shall, by dividend or
otherwise, distribute to all or substantially all holders of its outstanding shares of Common Stock
shares of any class of Capital Stock of the
Company (other than the Common Stock) or evidences of its indebtedness or assets, including
securities, but excluding (i) any rights or warrants referred to in Section 10.06(c), (ii) any
dividends or distributions in connection with a reclassification, changes, consolidation, merger,
combination or sale or conveyance to which Section 10.07 applies, (iii) any dividends or
distributions paid exclusively in cash or (iv) any dividends or distributions referred to in
Section 10.06(a) (any of the foregoing hereinafter in this Section 10.06(d)) called the
“Distributed Assets”), then, in each such case, the Conversion Rate shall be increased so that the
same shall be equal to the rate determined by multiplying the Conversion Rate in effect immediately
prior to the opening of business on the Ex-Date for such distribution by a fraction,

     (1) the numerator of which shall be the Current Market Price on the Ex-Date for such
distribution; and

     (2) the denominator of which shall be the Current Market Price on the Ex-Date for
such distribution minus the Fair Market Value (as determined by the Board of Directors,
whose determination shall be conclusive, and described in a resolution of the Board of
Directors) of the portion of the Distributed Assets so distributed applicable to one share
of Common Stock,

66

 

such adjustment to become effective immediately after the opening of business on the Ex-Date for
such distribution; provided that if (1) the then Fair Market Value (as so determined) of the
portion of the Distributed Assets so distributed applicable to one share of Common Stock is equal
to or greater than the Current Market Price on such Ex-Date or (2) the Current Market Price on such
Ex-Date exceeds the then Fair Market Value (as so determined) of the portion of the Distributed
Assets so distributed applicable to one share of Common Stock by less than $1.00, in lieu of the
foregoing adjustment, adequate provision shall be made so that each Holder of Securities shall have
the right to receive upon conversion, in addition to the cash and the shares of Common Stock, if
any, issuable upon conversion of Securities, for each $1,000 principal amount of Securities the
amount of Distributed Assets such Holder would have received had such Holder owned a number of
shares of Common Stock equal to the Conversion Rate in effect immediately prior to the record date
for the dividend or distribution. If such dividend or distribution is not so paid or made, the
Conversion Rate shall again be adjusted to be the Conversion Rate that would then be in effect if
such dividend or distribution had not been declared.

     If the Board of Directors determines the Fair Market Value of any distribution for purposes of
this Section 10.06(d) by reference to the actual or when issued trading market for any Distributed
Assets comprising all or part of such distribution, it must in doing so consider the prices in such
market over the same period (the “Reference Period”) used in computing the Current Market Price of
the Common Stock to the extent possible, unless the Board of Directors
determines in good faith that determining the Fair Market Value during the Reference Period
would not be in the best interest of the Holders.

     Notwithstanding the foregoing, in the event any such distribution consists of shares of
Capital Stock of, or similar equity interests in, one or more of the Company’s Subsidiaries (a
“Spin-Off”), the Conversion Rate in effect immediately before the Ex-Date for the distribution will
be increased by multiplying the Conversion Rate by an adjustment factor equal to the sum of the
Daily Adjustments (as defined below) for each of the 10 consecutive Trading Days beginning on the
Ex-Date for the distribution. The “Daily Adjustment” for any given Trading Day is equal to the
fraction:

     (1) the numerator of which is the Closing Sale Price of the Common Stock on that
Trading Day plus the Closing Sale Price of the portion of those shares of Capital Stock or
similar equity interests so distributed applicable to one share of the Common Stock on
that Trading Day, and

     (2) the denominator of which is the product of 10 and the Closing Sale Price of the
Common Stock on that Trading Day.

67

 

     The adjustment to the Conversion Rate in the event of a Spin-Off will occur retroactively on
the Ex-Date for the distribution. In the event that such dividend or distribution is not so paid
or made, the Conversion Rate shall again be adjusted to be the Conversion Rate that would then be
in effect if such dividend or distribution had not been declared.

     For purposes of this Section 10.06(d) and Sections 10.06(a) and 10.06(c), any dividend or
distribution to which this Section 10.06(d) is applicable that also includes shares of Common
Stock, or rights or warrants to subscribe for or purchase shares of Common Stock (or both), shall
be deemed instead to be (1) a dividend or distribution of the evidences of indebtedness, assets or
shares of Capital Stock other than such shares of Common Stock or rights or warrants (and any
Conversion Rate adjustment required by this Section 10.06(d) with respect to such dividend or
distribution shall then be made) immediately followed by (2) a dividend or distribution of such
shares of Common Stock or such rights or warrants (and any further Conversion Rate adjustment
required by Section 10.06(a) or 10.06(c) with respect to such dividend or distribution shall then
be made), except the Ex-Date for such dividend or distribution shall be substituted for “the
“Ex-Date for such dividend or other distribution” within the meaning of Section 10.06(a) and the
“Ex-Date for such issuance” within the meaning of Section 10.06(c) and any shares of Common Stock
included in such dividend or distribution shall not be deemed “outstanding immediately prior to the
opening of business on the Ex-Date for such dividend or distribution” within the meaning of Section
10.06(a).

     (e) In case the Company shall, by dividend or otherwise, distribute to all or substantially
all holders of its Common Stock cash (including any quarterly cash dividend, but excluding (x) any
dividend or distribution in connection with the liquidation, dissolution or winding up of the
Company, whether voluntary or involuntary and (y) any dividend or distribution in connection with a
merger, consolidation or sale to which Section 10.07 applies), then the Conversion Rate shall be
increased so that the same shall equal the rate determined by multiplying the Conversion Rate in
effect immediately prior to the opening of business on the Ex-Date for such distribution by a
fraction,

     (1) the numerator of which shall be the Current Market Price on the Ex-Date for such
distribution; and

     (2) the denominator of which shall be the Current Market Price of the Common Stock on
the Ex-Date for such distribution minus the amount of the cash dividend or distribution
applicable to one share of Common Stock,

68

 

such adjustment to be effective immediately after the opening of business on the Ex-Date for such
distribution; provided that in the event (1) the portion of the cash so distributed applicable to
one share of Common Stock is equal to or greater than the Current Market Price or (2) the Current
Market Price exceeds the per share amount of such dividend by less than $1.00, in lieu of the
foregoing adjustment, adequate provision shall be made so that each Holder of Securities shall have
the right to receive at the same time as holders of the Common Stock for each $1,000 principal
amount of Securities the amount of cash such Holder would have received had such Holder owned a
number of shares of Common Stock equal to the Conversion Rate in effect immediately prior to the
record date for the dividend or distribution. If such dividend or distribution is not so paid or
made, the Conversion Rate shall again be adjusted to be the Conversion Rate that would then be in
effect if such dividend or distribution had not been declared.

     (f) In case a tender or exchange offer made by the Company or any Subsidiary for all or any
portion of the Common Stock shall expire and such tender or exchange offer (as amended upon the
expiration thereof) shall require the payment to stockholders of consideration per share of Common
Stock having a Fair Market Value (which, if other than cash, shall be as determined by the Board of
Directors, whose determination shall be conclusive and described in a resolution of the Board of
Directors) that as of the last time (the “Expiration Time”) tenders or exchanges may be made
pursuant to such tender or exchange offer (as it may be amended) exceeds the Closing Sale Price of
a share of Common Stock on the Trading Day next succeeding the Expiration Time, the Conversion Rate
shall be increased so that the same shall equal the rate determined by multiplying the Conversion
Rate in effect at the close of business on the Trading Day next succeeding the Expiration Time by a
fraction,

     (1) the numerator of which shall be the sum of (x) the Fair Market Value (determined
as aforesaid) of the aggregate consideration paid to stockholders for all shares accepted
for purchase the tender or exchange offer (the “Purchased Shares”) and (y) the product of
the number of shares of Common Stock outstanding (less any Purchased Shares) at the
Expiration Time and the Closing Sale Price of a share of Common Stock on the Trading Day
next succeeding the Expiration Time, and

     (2) the denominator of which shall be the product of the number of shares of Common
Stock outstanding (including any Purchased Shares) at the Expiration Time multiplied by
the Closing Sale Price of a share of Common Stock on the Trading Day next succeeding the
Expiration Time,

69

 

such adjustment to become effective immediately after the close of business on the Trading Day next
succeeding the Expiration Time. If the Company is obligated to purchase shares pursuant to any
such tender or exchange offer, but the Company is permanently prevented by applicable law from
effecting any such purchases or any such purchases are rescinded, the Conversion Rate shall again
be adjusted to be the Conversion Rate that would then be in effect if such tender or exchange offer
had not been made for the shares not purchased. In no event shall the Conversion Rate be reduced
pursuant to this Section 10.06(f).

     (g) Except as provided below, in case a tender or exchange offer made by a Person other than
the Company or any of its Subsidiaries for all or any portion of the Common Stock shall expire, the
Board of Directors has not recommended rejection of such tender of exchange offer and such tender
or exchange offer (as amended upon the expiration thereof) shall require the payment to
stockholders of consideration per share of Common Stock having a Fair Market Value (as determined
by the Board of Directors, whose determination shall be conclusive and described in a resolution of
the Board of Directors) that as of the last time (the “Offer Expiration Time”) tenders or exchanges
may be made pursuant to such tender or exchange offer (as it may be amended) exceeds the Closing
Sale Price of a share of Common Stock on the Trading Day next succeeding the Offer Expiration Time,
the Conversion Rate shall equal the rate determined by multiplying the Conversion Rate in effect at
the close of business on the Trading Day next succeeding the Offer Expiration Time by a fraction,

     (1) the numerator of which shall be the sum of (x) the Fair Market Value (determined
as aforesaid) of the aggregate consideration payable to stockholders based on the
acceptance (up to any maximum specified in the terms of the tender or exchange offer) of
all shares validly tendered or exchanged and not withdrawn as of the Offer Expiration Time
(the shares deemed so accepted up to any such maximum, being referred to as the “Accepted
Purchased Shares”) and (y) the product of the
number of shares of Common Stock outstanding (less any Accepted Purchased Shares) at
the Offer Expiration Time and the Closing Sale Price of a share of Common Stock on the
Trading Day next succeeding the Offer Expiration Time; and

     (2) the denominator of which shall be the number of shares of Common Stock
outstanding (including any Accepted Purchased Shares) at the Offer Expiration Time
multiplied by the Closing Sale Price of a share of Common Stock on the Trading Day next
succeeding the Offer Expiration Time,

such adjustment to become effective immediately after the close of business on the Trading Day next
succeeding the Offer Expiration Time.

70

 

     The foregoing adjustment (A) shall be made only if (i) the tender offer or exchange offer is
for an amount that increases the ownership of Common Stock by the Person making such offer to more
than 25% of the total shares of Common Stock outstanding and (ii) if the cash and value of any
other consideration
included in such payment per share of Common Stock validly tendered or exchanged exceeds the
Closing Sale Price on the Business Day immediately following the last date on which tenders or
exchanges may be made pursuant to such tender or exchange offer, and (B) will not be made if as of
the Offer Expiration Time, the tender offer documents disclose a plan or intention to cause the
Company to engage in a consolidation or merger or sale of all or substantially all of the assets of
the Company and its Subsidiaries taken as a whole. If the Person making the tender or exchange
offer is permanently prevented by applicable law from effecting any such purchases or all such
purchases are rescinded, the Conversion Rate shall again be adjusted to be the Conversion Rate that
would then be in effect if such tender or exchange offer had not been made. In no event shall the
Conversion Rate be reduced pursuant to this Section 10.06(g).

     (h) The Company may in its sole discretion make such increases in the Conversion Rate, in
addition to those required by Sections 10.06(a)-(g), as the Board of Directors considers to be
advisable to avoid or diminish any U.S. federal income tax to holders of Common Stock resulting
from any dividend or distribution of stock (or rights to acquire stock) or from any event treated
as such for income tax purposes; provided that such increase in the Conversion Rate shall not
adversely affect the interests of the Holders of Securities (after taking into account U.S. federal
income tax and other consequences of such increase).

     (i) To the extent permitted by applicable law, the Company from time to time may increase the
Conversion Rate by any amount for any period of time if the period is at least 20 Business Days,
the increase is irrevocable during the period and the Board of Directors shall have made a
determination that such increase would be in the best interests of the Company, which determination
shall be conclusive. Whenever the Conversion Rate is increased pursuant to the preceding sentence,
the Company shall mail to Holders of record of the Securities a notice of the increase, which
notice will be given at least 15 days prior to the effectiveness of any such increase, and such
notice shall state the increased Conversion Rate and the period during which it will be in effect.

     (j) No adjustment in the Conversion Rate shall be required unless such adjustment would
require an increase or decrease of at least one percent (1%) in such rate; provided that any
adjustments that by reason of this Section 10.06(j) are not required to be made shall be carried
forward and the Company shall make such carry forward adjustments, regardless of whether the
aggregate adjustment is less than 1%, (x) annually on the anniversary of the first date of the
issue of the Securities and otherwise (y)(1) on each day from and after the 25th
Scheduled

71

 

Trading Day prior to the maturity of the Securities (whether its Maturity Date or
otherwise), (2) if the Securities are called for redemption, on each day from and including the
30th calendar day before the Redemption Date and (3) in connection with a Fundamental
Change on each day from and including the 10th calendar day prior to the anticipated
Effective Date of the Fundamental Change to the Effective Date of the Fundamental Change. All
calculations under this Article 10 shall be
made by the Company and shall be made to the nearest cent or to the nearest one-ten thousandth
(1/10,000) of a share, as the case may be. No adjustment need be made for rights to purchase
Common Stock pursuant to a Company plan for reinvestment of dividends or interest or for any
issuance of Common Stock or convertible or exchangeable securities or rights to purchase Common
Stock or convertible or exchangeable securities. Interest will not accrue on any cash into which
the Securities are convertible.

     (k) Whenever the Conversion Rate is adjusted as herein provided, the Company will issue a
press release through Business Wire containing the relevant information and make this information
available on the Company’s website or through another public medium as the Company may use at that
time. In addition, the Company shall promptly file with the Trustee and any Conversion Agent other
than the Trustee an Officers’ Certificate setting forth the Conversion Rate after such adjustment
and setting forth a brief statement of the facts requiring such adjustment. Unless and until a
Trust Officer of the Trustee shall have received such Officers’ Certificate, the Trustee shall not
be deemed to have knowledge of any adjustment of the Conversion Rate and may assume that the last
Conversion Rate of which it has actual knowledge is still in effect. Promptly after delivery of
such certificate, the Company shall prepare a notice of such adjustment of the Conversion Rate
setting forth the adjusted Conversion Rate and the date on which each adjustment becomes effective
and shall mail such notice of such adjustment of the Conversion Rate to the Holder of each
Securities at his last address appearing on the Register, within 20 calendar days after execution
thereof. Failure to deliver such notice shall not affect the legality or validity of any such
adjustment.

     (l) In
any case in which this Section 10.06 provides that an adjustment shall become
effective (1) upon the opening of business on an Ex-Date, (2) immediately after the record date for
an event, or (3) after the Expiration Time for any tender or exchange offer pursuant to Section
10.06(f), (each a “Determination Date”), the Company may elect to defer until the occurrence of the
applicable distribution, issuance of Common Stock or payment (an “Adjustment Event”) triggering a
Conversion Rate adjustment (x) issuing to the Holder of any Securities converted after such
Determination Date and before the occurrence of such Adjustment Event, the additional cash, shares
of Common Stock, if any, or other securities or property issuable upon such conversion by reason of
the adjustment required by such Adjustment Event over and above the cash, the Common Stock, or
combination of

72

 

cash and Common Stock, issuable upon such conversion before giving effect to such
adjustment and (y) paying to such Holder any amount in cash in lieu of any fractional share.

     (m) For purposes of this Section 10.06, the number of shares of Common Stock at any time
outstanding shall not include shares held in the treasury of the Company but shall include shares
issuable in respect of scrip certificates issued in lieu of fractions of shares of Common Stock.

     (n) No adjustment to the Conversion Rate shall be made pursuant to Section 10.06 on account of
a distribution on Common Stock, if the Holders of the Securities will otherwise participate for
each $1,000 principal amount of Securities in such distribution without conversion as a result of
holding the Securities at the same time and on the same terms as a holder of a number of shares of
Common Stock equal to the Conversion Rate.

     (o) Notwithstanding the foregoing, no adjustment to the Conversion Rate need be made for:

     (i) the issuance of any shares of Common Stock pursuant to any present or future plan
providing for the reinvestment of dividends or interest payable on the Company’s
securities and the investment of additional optional amounts in shares of Common Stock
under any plan, or

     (ii) the issuance of any shares of Common Stock or options or rights to purchase
those shares pursuant to any present or future employee, director or consultant benefit
plan or program of or assumed by the Company or any of its Subsidiaries.

     (p) Notwithstanding the above, certain listing standards of The Nasdaq Global Select Market
may limit the amount by which the Company may increase the Conversion Rate pursuant to the events
described in Section 10.06(c) through Section 10.06(g) and as described in Section 10.05. These
standards generally require the Company to obtain the approval of the Company’s stockholders before
entering into certain transactions that potentially could result in the issuance of 20% or more of
Common Stock outstanding at the time the Securities are issued. Accordingly, in the event of an
increase in the applicable Conversion Rate above that which would result in the Securities, in the
aggregate, becoming convertible into shares of Common Stock in excess of such limitations,
including any potential increase in the applicable Conversion Rate in connection with a Non-Stock
Change of Control, the Company will, at the Company’s option, either obtain stockholder approval of
such issuances or deliver cash in lieu of any shares of Common Stock otherwise deliverable upon
conversions in excess of such

73

 

limitations (based on the Closing Sale Price of the Common Stock on
the Trading Day immediately prior to the date when such shares of Common Stock would otherwise be
required to be distributed).

     (q) Notwithstanding this Section 10.06 and the other provisions of Article 10, if any
Conversion Rate adjustment becomes effective, or any Ex-Date (relating to a required Conversion
Rate adjustment) occurs, during the period beginning on a Conversion Date and ending on close of
business on the last Trading Day of the corresponding Conversion Observation Period, the Board of
Directors may make adjustments to the Conversion Rate or the amount of cash or number of shares of
Common Stock issuable upon conversion of the Securities, as
may be necessary or appropriate to effect the intent of this Section 10.06 and the other
provisions of Article 10 and to avoid unjust or inequitable results, as determined in good faith by
the Board of Directors. Any adjustment made pursuant to this Section 10.06(q) shall apply in lieu
of the adjustment or other term that would otherwise be applicable.

     Section 10.07. Effect of Reclassification, Consolidation, Merger or Sale. If any of the
following events occur, namely:

     (a) any reclassification or change of the outstanding Common Stock (other than as a result of
a subdivision or combination),

     (b) any consolidation or merger of the Company with or into another Person or

     (c) any sale, lease, transfer, conveyance or other disposition of all or substantially all of
the Company’s assets and those of its Subsidiaries taken as a whole to any other Person or Persons,

as a result of which holders of Common Stock shall be entitled to receive stock, other securities
or other property or assets (including cash or any combination thereof) with respect to or in
exchange for such Common Stock, in each case, the Company or the successor or purchasing
corporation, as the case may be, shall execute with the Trustee a supplemental indenture (which
shall comply with the Trust Indenture Act as in force at the date of execution of such supplemental
indenture, if such supplemental indenture is then required to so comply) providing that such
Securities shall, without the consent of any Holders of Securities, be convertible into the kind
and amount of shares of stock and other securities or property or assets (including cash or any
combination thereof) (the “Applicable Consideration”) that such Holder would have been entitled to
receive upon such reclassification, change, consolidation, merger, sale, lease, transfer,
conveyance or other disposition had each $1,000 principal amount of Securities been converted into
a number of shares of Common Stock equal to the Conversion

74

 

Rate immediately prior to such
reclassification, change, consolidation, merger, sale, lease, transfer, conveyance or other
disposition, except that after the adjustment of the conversion obligation under this Section
10.07, the provisions for settlement upon conversion set forth in Section 10.13 shall continue to
apply; provided that any increase in the Conversion Rate in connection with a Non Stock Change of
Control under Section 10.05 shall be in effect under this Section 10.07 only until the close of
business on the Fundamental Change Repurchase Date relating to the Non Stock Change of Control.
If holders of Common Stock have the opportunity to elect the form of consideration to be received
in an event covered by this Section 10.07, the Company will make adequate provision whereby the
Holders of the Securities shall have a reasonable opportunity to determine the form of
consideration into which the Securities treated as a single class, shall be convertible from and
after the effective date of the reclassification,
change, consolidation, merger, sale, lease, transfer, conveyance or other disposition. The Company
shall not become a party to such a transaction unless its terms are consistent with this Section
10.07. If, in the case of any such reclassification, change, consolidation, merger, sale, lease,
transfer, conveyance or other disposition, the stock or other securities and assets receivable
thereupon by a holder of Common Stock includes shares of stock or other securities and assets of a
corporation other than the successor or purchasing corporation, as the case may be, in such
reclassification, change, consolidation, merger, sale, lease, transfer, conveyance or other
disposition, then such supplemental indenture shall also be executed by such other corporation and
shall contain such additional provisions to protect the interests of the Holders of the Securities
as the Board of Directors shall reasonably consider necessary by reason of the foregoing, including
to the extent practicable the provisions providing for the conversion rights set forth in this
Article 10.

     The Company shall cause notice of the execution of such supplemental indenture to be mailed to
each Holder, at the address of such Holder as it appears on the register of the Securities
maintained by the Registrar, within 20 days after execution thereof. Failure to deliver such
notice shall not affect the legality or validity of such supplemental indenture.

     The above provisions of this Section 10.07 shall similarly apply to successive
reclassifications, changes, consolidations, mergers, sales, leases, transfers, conveyances or other
dispositions.

     If this Section 10.07 applies to any event or occurrence, Section 10.06 shall not apply.

     Section 10.08. Taxes on Shares Issued. The issue of stock certificates on conversions of
Securities shall be made without charge to the converting Holder of Securities for any documentary,
stamp or similar issue or transfer tax in respect

75

 

of the issue thereof. The Company shall not,
however, be required to pay any such tax which may be payable in respect of any transfer involved
in the issue and delivery of stock in any name other than that of the Holder of any Securities
converted, and the Company shall not be required to issue or deliver any such stock certificate
unless and until the Person or Persons requesting the issue thereof shall have paid to the Company
the amount of such tax or shall have established to the satisfaction of the Company that such tax
has been paid.

     Section 10.09. Reservation of Shares, Shares to be Fully Paid; Compliance with Governmental
Requirements; Listing of Common Stock. The Company shall provide, free from preemptive rights, out
of its authorized but unissued shares or shares held in treasury, sufficient shares of Common Stock
to provide for the conversion of the Securities, including any Additional Shares, from time to time
as such Securities are presented for conversion.

     Before taking any action which would cause an adjustment increasing the Conversion Rate to an
amount that would cause the Conversion Price to be reduced below the then par value, if any, of the
shares of Common Stock issuable upon conversion of the Securities, the Company will take all
corporate action which may, in the opinion of its counsel, be necessary in order that the Company
may validly and legally issue shares of such Common Stock at such adjusted Conversion Rate.

     The Company covenants that all shares of Common Stock which may be issued upon conversion of
Securities will upon issue be fully paid and non-assessable by the Company and free from all taxes,
liens and charges with respect to the issue thereof.

     The Company covenants that, if any shares of Common Stock to be provided for the purpose of
conversion of Securities hereunder require registration with or approval of any governmental
authority under any federal or state law before such shares may be validly issued upon conversion,
the Company will in good faith and as expeditiously as possible, to the extent then permitted by
the rules and interpretations of the Commission (or any successor thereto), endeavor to secure such
registration or approval, as the case may be.

     The Company further covenants that, if at any time the Common Stock shall be listed on The
Nasdaq Global Select Market or any other national securities exchange or automated quotation
system, the Company will, if permitted by the rules of such exchange or automated quotation system,
list and keep listed, so long as the Common Stock shall be so listed on such exchange or automated
quotation system, all Common Stock issuable upon conversion of the Securities; provided that if the
rules of such exchange or automated quotation system permit the Company to defer the listing of
such Common Stock until the

76

 

first conversion of the Securities into Common Stock in accordance with
the provisions of this Indenture, the Company covenants to list such Common Stock issuable upon
conversion of the Securities in accordance with the requirements of such exchange or automated
quotation system at such time.

     Section 10.10. Responsibility of Trustee. The Trustee and any other Conversion Agent shall
not at any time be under any duty or responsibility to any Holder of Securities to determine the
Conversion Rate or whether any facts exist which may require any adjustment of the Conversion Rate,
or with respect to the nature or extent or calculation of any such adjustment when made, or with
respect to the method employed, or herein or in any supplemental indenture provided to be employed,
in making the same. The Trustee and any other Conversion Agent shall not be accountable with
respect to the validity or value (or the kind or amount) of any shares of Common Stock, or of any
capital stock, other securities or other assets or property, which may at any time be issued or
delivered upon the conversion of any Securities; and the Trustee and any other Conversion Agent
make no representations with respect thereto. Neither the Trustee nor any
Conversion Agent shall be responsible for any failure of the Company to issue, transfer or
deliver any shares of Common Stock or stock certificates or other securities or property or cash
upon the surrender of any Securities for the purpose of conversion or to comply with any of the
duties, responsibilities or covenants of the Company contained in this Article 10. Without
limiting the generality of the foregoing, neither the Trustee nor any Conversion Agent shall be
under any responsibility to determine the correctness of any provisions contained in any
supplemental indenture entered into pursuant to Section 10.07 relating either to the kind or amount
of shares of capital stock or other securities or other assets or property (including cash)
receivable by Holders of Securities upon the conversion of their Securities after any event
referred to in such Section 10.07 or to any adjustment to be made with respect thereto, but,
subject to the provisions of Section 9.01, may accept as conclusive evidence of the correctness of
any such provisions, and shall be protected in relying upon, the Officers’ Certificate (which the
Company shall be obligated to file with the Trustee prior to the execution of any such supplemental
indenture) with respect thereto.

     Section 10.11. Notice to Holders Prior to Certain Actions. In case:

     (a) the Company shall declare a dividend (or any other distribution) on its Common Stock that
would require an adjustment in the Conversion Rate pursuant to Section 10.06; or

     (b) the Company shall authorize the granting to the Holders of all or substantially all of its
Common Stock or rights or warrants to subscribe for or purchase any share of any class of its
Capital Stock or any other rights or warrants

77

 

that would require an adjustment in the Conversion
Rate pursuant to Section 10.06;

     (c) of any reclassification or reorganization of the Common Stock of the Company (other than a
subdivision or combination of its outstanding Common Stock, or a change in par value, or from par
value to no par value, or from no par value to par value), or of any consolidation or merger to
which the Company is a party and for which approval of any stockholders of the Company is required,
or of the sale or transfer of all or substantially all of the assets of the Company; or

     (d) of the voluntary or involuntary dissolution, liquidation or winding up of the Company;

then the Company shall cause to be filed with the Trustee and to be mailed to each Holder of
Securities at its address appearing on the Register provided for in Section 2.05 of this Indenture,
as promptly as possible but in any event at least ten calendar days prior to the applicable date
hereinafter specified, a notice stating (x) the date on which a record is to be taken for the
purpose of such dividend, distribution or rights or warrants, or, if a record is not to be taken,
the date as of which the holders of Common Stock of record to be entitled to such dividend,
distribution or rights are to be determined, or (y) the date on which such reclassification,
reorganization, consolidation, merger, sale, transfer, dissolution, liquidation or winding up is
expected to become effective or occur, and the date as of which it is expected that holders of
Common Stock of record shall be entitled to exchange their Common Stock for securities or other
property deliverable upon such reclassification, reorganization, consolidation, merger, sale,
transfer, dissolution, liquidation or winding up; provided that a separate notice shall not be
required under this Section if such notice has been effectively provided under another provision of
this Indenture. Failure to give such notice, or any defect therein, shall not affect the legality
or validity of such dividend, distribution, reclassification, consolidation, merger, sale,
transfer, dissolution, liquidation or winding up.

     Section 10.12. Stockholder Rights Plans. To the extent that any stockholder rights plan
(i.e., a “poison pill”) adopted by the Company is in effect upon conversion of the Security, the
converting Holder shall receive, in addition to any shares of Common Stock issued in connection
with such conversion, the rights under the rights plan, unless prior to such conversion, the rights
plan has terminated or expired, all the rights have been redeemed or the rights have separated from
the Common Stock. There shall be no adjustment to the Conversion Rate with respect to the adoption
of any such rights plan and the distribution of the rights with respect to shares of Common Stock,
unless rights have separated from the Common Stock. If the rights provided for in any future
rights plan adopted by the Company have separated from the shares of Common

78

 

Stock in accordance
with the provisions of the applicable stockholder rights agreement so that the Holders of the
Securities would not be entitled to receive any rights in respect of Common Stock issuable upon
conversion of the Securities, the Conversion Rate will be adjusted as provided in Section 10.06(d),
subject to readjustment in the event of the expiration, termination or redemption of such rights.

     Section 10.13. Settlement Upon Conversion; Cash Percentage Election. (a) Upon any
conversion of Securities, the Company will deliver to converting Holders in respect of each $1,000
principal amount of Securities being converted a “Settlement Amount” equal to the sum of the Daily
Settlement Amounts for each of the 20 Trading Days during the Conversion Observation Period.
Settlement in cash and shares of Common Stock, if any, will occur no later than the fifth Trading
Day following the final Trading Day of the Conversion Observation Period.

     (b) By the close of business on the Business Day prior to the first Scheduled Trading Day of
the applicable Conversion Observation Period, the Company may specify a percentage of the Daily
Share Amount included in the Daily Settlement Amount that will be settled in cash (the “Cash
Percentage”) and will notify the Holder of such Cash Percentage through written notice to the
Trustee (the “Cash Percentage Notice”). If the Company elects to specify a
Cash Percentage, (x) the amount of cash that the Company will
deliver in respect of the Daily Share Amount for each
Trading Day in the applicable Observation Conversion Period will equal the product of: (i) the Cash
Percentage, (ii) the Daily Share Amount for such Trading Day (assuming for this purpose the Company
has not specified a Cash Percentage), and (iii) the VWAP Price for such Trading Day and (y) the
number of shares of Common Stock deliverable in respect of each Trading Day in the applicable
Observation Conversion Period (in lieu of the full Daily Share Amount for such Trading Day) will be
a percentage of the Daily Share Amount (assuming the Company has not specified a Cash Percentage)
equal to 100% minus the Cash Percentage.

     If the Company does not specify a Cash Percentage by the close of business on the Business Day
prior to the scheduled first Trading Day of the applicable Observation Conversion Period, the
Company must settle 100% of the Daily Share Amount for each Trading Day in the applicable
Conversion Observation Period with shares of Common Stock; provided that the Company shall pay cash
in lieu of fractional shares otherwise issuable upon conversion of such Securities.

79

 

ARTICLE 11

Miscellaneous

     Section 11.01. Trust Indenture Act Controls. If any provision of this Indenture limits,
qualifies or conflicts with another provision which is required to be included in this Indenture by
the TIA, the required provision shall control.

     Section 11.02. Notices. Any notice or communication shall be in writing and delivered in
person or mailed by first-class mail addressed as follows:

if to the Company:

Nuance Communications, Inc.

1 Wayside Road

Burlington, MA 01803

Attention: Chief Financial Officer

if to the Trustee:

U.S. Bank National Association

225 Asylum Street, 23rd Floor

Hartford, CT 06103

Attention: Elizabeth C. Hammer

     The Company or the Trustee by notice to the other may designate additional or different
addresses for subsequent notices or communications.

     Any notice or communication mailed to a Securityholder shall be mailed to the Securityholder
at the Securityholder’s address as it appears on the Register of the Registrar and shall be
sufficiently given if so mailed within the time prescribed.

     Failure to mail a notice or communication to a Securityholder or any defect in it shall not
affect its sufficiency with respect to other Securityholders. If a notice or communication is
mailed in the manner provided above, it is duly given, whether or not the addressee receives it.

     With respect to any Global Security, references in this Indenture to any required “mailing” of
a notice shall be deemed to refer to any other means of notice consistent with the Depositary’s
applicable procedures.

     Section 11.03. Communication by Securityholders with Other Securityholders. Securityholders
may communicate pursuant to TIA § 312(b) with other Securityholders with respect to their rights
under this Indenture or the

80

 

Securities. The Company, the Trustee, the Registrar and anyone else
shall have the protection of TIA § 312(c).

     Section 11.04. Certificate and Opinion as to Conditions Precedent. Upon any request or
application by the Company to the Trustee to take or refrain from taking any action under this
Indenture, the Company shall furnish to the Trustee:

     (a) an Officers’ Certificate in form and substance reasonably satisfactory to the Trustee
stating that, in the opinion of the signers, all conditions precedent, if any, provided for in this
Indenture relating to the proposed action have been complied with; and

     (b) an Opinion of Counsel in form and substance reasonably satisfactory to the Trustee stating
that, in the opinion of such counsel, all such conditions precedent have been complied with.

     Section 11.05. Statements Required in Certificate or Opinion. Each certificate or opinion
with respect to compliance with a covenant or condition provided for in this Indenture shall
include:

     (a) a statement that the individual making such certificate or opinion has read such covenant
or condition;

     (b) a brief statement as to the nature and scope of the examination or investigation upon
which the statements or opinions contained in such certificate or opinion are based;

     (c) a statement that, in the opinion of such individual, he has made such examination or
investigation as is necessary to enable him to express an informed
opinion as to whether or not such covenant or condition has been complied with; and

     (d) a statement as to whether or not, in the opinion of such individual, such covenant or
condition has been complied with.

     Section 11.06. When Securities Disregarded. In determining whether the Securityholders of
the required principal amount of Securities have concurred in any direction, waiver or consent,
Securities owned by the Company or by any Person directly or indirectly controlling or controlled
by or under direct or indirect common control with the Company shall be disregarded and deemed not
to be outstanding, except that, for the purpose of determining whether the Trustee shall be
protected in relying on any such direction, waiver or consent, only Securities which the Trustee
knows are so owned shall be so disregarded. Subject to the

81

 

foregoing, only Securities outstanding
at the time shall be considered in any such determination.

     Section 11.07. Rules by Trustee, Paying Agent and Registrar. The Trustee may make
reasonable rules for action by or a meeting of Securityholders. The Registrar and the Paying Agent
may make reasonable rules for their functions.

     Section 11.08. Legal Holidays. A “Legal Holiday” is a Saturday, a Sunday or a day on which
banking institutions are not required to be open in the State of New York or the location of the
Corporate Trust Office or place of payment. If a payment date is a Legal Holiday, payment shall be
made on the next succeeding day that is not a Legal Holiday, and no interest shall accrue for the
intervening period. If a regular record date is a Legal Holiday, the record date shall not be
affected.

     Section 11.09. GOVERNING LAW. THIS INDENTURE AND THE SECURITIES SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

     Section 11.10. No Recourse Against Others. A director, officer, employee or stockholder, as
such, of the Company shall not have any liability for any obligations of the Company under the
Securities or this Indenture or for any claim based on, in respect of or by reason of such
obligations or their creation. By accepting a Security, each Securityholder shall waive and
release all such liability. The waiver and release shall be part of the consideration for the
issue of the Securities.

     Section 11.11. Successors. All agreements of the Company in this Indenture and the
Securities shall bind its successors. All agreements of the Trustee in this Indenture shall bind
its successors.

     Section 11.12. Multiple Originals. The parties may sign any number of copies of this
Indenture. Each signed copy shall be an original, but all of them together represent the same
agreement. One signed copy is enough to prove this Indenture.

     Section 11.13. Table of Contents; Headings. The table of contents, cross-reference sheet
and headings of the Articles and Sections of this Indenture have been inserted for convenience of
reference only, are not intended to be considered a part hereof and shall not modify or restrict
any of the terms or provisions hereof.

     Section 11.14. Calculations in Respect of the Securities. Except as otherwise provided in
Section 10.01(b) of this Indenture, the Company will be responsible for making all calculations
called for under the Indenture or the

82

 

Securities. These calculations include, but are not limited
to, determinations of the Closing Sale Price of the Common Stock, accrued interest payable on the
Securities, the Conversion Rate and Conversion Price. The Company or its agents will make all these
calculations in good faith and, absent manifest error, such calculations will be final and binding
on Holders of the Securities. The Company will provide a schedule of these calculations to each of
the Trustee and the Paying Agent upon request, and each of the Trustee and Conversion Agent is
entitled to rely upon the accuracy of such calculations without independent verification. The
Trustee will forward these calculations to any Holder of the Securities upon the request of that
Holder.

83

 

     IN WITNESS WHEREOF, the parties have caused this Indenture to be duly executed as of the date
first written above.

	 	 	 	 	 
	 	NUANCE COMMUNICATIONS, INC.,

        as Issuer

 	 
	 	By:  	/s/
James R. Arnold 	 
	 	 	Name:  	James R. Arnold 	 
	 	 	Title:  	Chief Financial Officer 	 
	 

	 	 	 	 	 
	 	U.S. BANK NATIONAL ASSOCIATION,

        as Trustee

 	 
	 	By:  	/s/
Elizabeth C. Hammer 	 
	 	 	Name:  	Elizabeth C. Hammer 	 
	 	 	Title:  	Vice President 	 
	 

84

 

EXHIBIT A

[FORM OF FACE OF SECURITY]

[Form of Global Securities Legend]

     UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST
COMPANY, A NEW YORK CORPORATION (“DTC”), NEW YORK, NEW YORK, TO THE COMPANY OR ITS AGENT FOR
REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME
OF CEDE & CO. OR SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY
PAYMENT IS MADE TO CEDE & CO., OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO
ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

     TRANSFERS OF THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS IN WHOLE, BUT NOT IN PART, TO
NOMINEES OF DTC OR TO A SUCCESSOR THEREOF OR SUCH SUCCESSOR’S NOMINEE AND TRANSFERS OF PORTIONS OF
THIS GLOBAL SECURITY SHALL BE LIMITED TO TRANSFERS MADE IN ACCORDANCE WITH THE RESTRICTIONS SET
FORTH IN THE INDENTURE REFERRED TO ON THE REVERSE HEREOF.

 

 

[Form of Restricted Security Legend]

     THE SECURITY EVIDENCED HEREBY AND THE SHARES OF COMMON STOCK ISSUABLE UPON CONVERSION OF THIS
SECURITY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES
ACT”), OR ANY STATE SECURITIES LAWS. NEITHER THIS SECURITY, THE SHARES OF COMMON STOCK ISSUABLE
UPON CONVERSION OF THIS SECURITY NOR ANY INTEREST OR PARTICIPATION HEREIN OR THEREIN MAY BE
REOFFERED, SOLD, ASSIGNED, TRANSFERRED, PLEDGED, ENCUMBERED OR OTHERWISE DISPOSED OF IN THE ABSENCE
OF SUCH REGISTRATION OR UNLESS SUCH TRANSACTION IS EXEMPT FROM, OR NOT SUBJECT TO, REGISTRATION
UNDER THE SECURITIES ACT.

     BY ITS ACQUISITION HEREOF, THE HOLDER AGREES TO OFFER, SELL OR OTHERWISE TRANSFER SUCH
SECURITIES PRIOR TO THE DATE WHICH IS TWO YEARS AFTER THE LATER OF THE ORIGINAL ISSUE DATE HEREOF
AND THE LAST DATE ON WHICH NUANCE COMMUNICATIONS, INC. (THE “COMPANY”) OR ANY AFFILIATE OF THE
COMPANY WAS THE OWNER OF THIS SECURITY (OR ANY PREDECESSOR OF THIS SECURITY) (THE “RESALE
RESTRICTION TERMINATION DATE”) ONLY (A) TO THE COMPANY OR ANY SUBSIDIARY THEREOF, (B) PURSUANT TO A
REGISTRATION STATEMENT WHICH HAS BEEN DECLARED EFFECTIVE UNDER THE SECURITIES ACT, (C) FOR SO LONG
AS THE SECURITIES ARE ELIGIBLE FOR RESALE PURSUANT TO RULE 144A UNDER THE SECURITIES ACT (“RULE
144A”), TO A PERSON IT REASONABLY BELIEVES IS A “QUALIFIED INSTITUTIONAL BUYER” AS DEFINED IN RULE
144A THAT PURCHASES FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL BUYER TO
WHOM NOTICE IS GIVEN THAT THE TRANSFER IS BEING MADE IN RELIANCE ON RULE 144A, (D) PURSUANT TO
ANOTHER AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT, SUBJECT TO
THE COMPANY’S AND THE TRUSTEE’S RIGHT PRIOR TO ANY SUCH OFFER, SALE OR TRANSFER PURSUANT TO CLAUSE
(D) TO REQUIRE THE DELIVERY OF AN OPINION OF COUNSEL, CERTIFICATION AND/OR OTHER INFORMATION
SATISFACTORY TO EACH OF THEM, AND IN EACH OF THE FOREGOING CASES, TO REQUIRE THAT A CERTIFICATE OF
TRANSFER IN THE FORM APPEARING ON THE OTHER SIDE OF THIS SECURITY IS COMPLETED AND DELIVERED BY THE
TRANSFEROR TO THE TRUSTEE. THIS LEGEND WILL BE REMOVED UPON THE REQUEST OF THE HOLDER AFTER THE
RESALE RESTRICTION TERMINATION DATE.

 

 

			
	 	 	 
	No. ___
	 	$                     

2.75% Senior Convertible Debenture due 2027

CUSIP No.:                     

ISIN Number:                     

     Nuance Communications, Inc., a Delaware corporation, promises to pay to [Cede & Co., or its
registered assigns]1, the principal sum of                      Dollars, [as
revised by the Schedule of Increases or Decreases in Global Security attached hereto,]2
on August 15, 2027.

     Interest Payment Dates: February 15 and August 15.

     Interest Record Dates: February 1 and August 1.

     Reference is made to the further provisions of this Security set forth on the reverse hereof,
including, without limitation, provisions giving the Holder of this Security the right to convert
this Security into cash and, if applicable, Common Stock, on the terms and subject to the
limitations referred to on the reverse hereof and as more fully specified in the Indenture. Such
further provisions shall for all purposes have the same effect as though fully set forth at this
place.

     This Security shall not be valid or become obligatory for any purpose until the certificate of
authentication hereon shall have been manually signed by the Trustee or a duly authorized
authenticating agent under the Indenture.

     IN WITNESS WHEREOF, the parties have caused this instrument to be duly executed.

	 	 	 	 	 
	 	NUANCE COMMUNICATIONS, INC.,

        as Issuer

 	 
	 	By:  	 	 
	 	 	Name:  	 	 
	 	 	Title:  	 	 
	 

Dated:

 

			
	1	 	Use bracketed language for a Global Security.
	 
	2	 	Use bracketed language for a Global Security.

 

 

	 	 	 	 	 
	 	TRUSTEE’S CERTIFICATE OF

       AUTHENTICATION

U.S. BANK NATIONAL ASSOCIATION, as

       Trustee, certifies that this is one

       of the Securities referred to in

       the Indenture.

 	 
	 	By:  	 	 
	 	 	Authorized Signatory 	 
	 	 	 	 
	 

 

 

[FORM OF REVERSE SIDE OF SECURITY]

2.75% Senior Convertible Debenture due 2027

1. Interest

     (a) NUANCE COMMUNICATIONS, INC., a Delaware corporation (such corporation, and its successors
and assigns under the Indenture hereinafter referred to, being herein called the “Company”),
promises to pay interest on the principal amount of this Security at the rate of 2.75% per annum.
The Company will pay interest semiannually on February 15 and August 15 of each year commencing on
February 15, 2008. Interest on the Security will accrue from the most recent date to which
interest has been paid or, if no interest has been paid, from August 13, 2007. Interest will be
computed on the basis of a 360-day year of twelve 30-day months. If a payment date is not a
Business Day, payment will be made on the next succeeding Business Day, and no additional interest
will accrue in respect of such payment by virtue of the payment being made on such later date.

     (b) The Holder of this Security is entitled to the benefits of a Registration Rights
Agreement, dated as of August 13, 2007, among the Company, and the Initial Purchasers named therein
(the “Registration Rights Agreement”) providing for the payment of additional interest. The
Company may also elect to pay additional interest on this Security as a remedy for an Event of
Default relating to a failure to file with the Trustee reports required under the Exchange Act.

     (c) Except as otherwise specifically set forth, all references herein to “interest” include
Additional Interest under the Registration Rights Agreement and additional interest that the
Company elects to pay in connection with a failure to file reports required under the Exchange Act.

2. Paying Agent, Registrar and Conversion Agent

     Initially, U.S. Bank National Association, a national banking association (the “Trustee”),
will act as Paying Agent, Registrar and Conversion Agent. The Company may appoint and change any
Paying Agent, Registrar or co-registrar or Conversion Agent without notice. The Company or any of
its domestically incorporated wholly owned Subsidiaries may act as Paying Agent, Registrar or
co-registrar, or Conversion Agent.

3. Indenture

     The Company issued the Securities under an Indenture dated as of August 13, 2007 (the
“Indenture”), between the Company and the Trustee. The terms of

 

 

the Securities include those
stated in the Indenture and those made part of the Indenture by reference to the Trust Indenture
Act of 1939 (15 U.S.C. §§ 77aaa-
77bbbb) as in effect on the date of the Indenture (the “TIA”). Terms defined in the Indenture
and not defined herein have the meanings ascribed thereto in the Indenture (except as specifically
provided in Section 1(b)). The Securities are subject to all such terms, and Securityholders are
referred to the Indenture and the TIA for a statement of those terms.

     This Security is one of the Securities referred to in the Indenture issued in an initial
aggregate principal amount of $250 million. Additional Securities may be issued in accordance with
the Indenture. The Indenture also imposes limitations on the ability of the Company to consolidate
or merge with or into any other Person or convey, transfer or lease all or substantially all of the
property of the Company.

5. Optional Redemption

     The Securities will not be redeemable at the option of the Company prior to August 20, 2014.
At any time on or after August 20, 2014, the Securities will be redeemable at the option of the
Company, in whole or in part, on not less than 30 days nor more than 60 Business Days prior notice,
at a Redemption Price equal to 100% of the principal amount of the Securities being redeemed, plus
accrued and unpaid interest to, but excluding, the Redemption Date.

6. Repurchase of Securities at the Option of Securityholders

     If a Fundamental Change occurs at any time prior to maturity of the Security, this Security
will be subject to a repurchase on the terms and conditions of the Indenture, at the option of the
Holder, on a Fundamental Change Repurchase Date, specified by the Company.

     Subject to the terms and conditions of the Indenture, each Holder shall have the right, at
such Holder’s option, to require the Company to repurchase all or any portion of the Securities
held by such Holder, on August 15, 2014, August 15, 2017 and August 15, 2022.

7. Conversion

     Upon the occurrence of certain events specified in the Indenture and in compliance with the
provisions of the Indenture, on or prior to the close of business on the Business Day immediately
preceding the Maturity Date of this Security, the Holder hereof has the right, at its option, to
convert each $1,000 principal amount of this Security into a combination of cash and Common Stock,
determined as set forth in the Indenture, based on a Conversion Rate of 51.3736

 

 

shares of Common
Stock per $1,000 principal amount of Securities, as the same may be adjusted pursuant to the terms
of the Indenture.

8. Denominations, Transfer, Exchange

     The Securities are in registered form without coupons in denominations of $1,000 and whole
multiples of $1,000. A Securityholder may transfer or exchange Securities in accordance with the
Indenture. Upon any transfer or exchange, the Registrar and the Trustee may require a
Securityholder, among other things, to furnish appropriate endorsements or transfer documents and
to pay any taxes required by law or permitted by the Indenture.

9. Persons Deemed Owners

     The registered Holder of this Security may be treated as the owner of it for all purposes.

10. Defaults and Remedies

     If an Event of Default (other than an Event of Default relating to certain events of
bankruptcy, insolvency or reorganization of the Company) occurs and is continuing, the Trustee or
the Holders of at least 25% in principal amount of the outstanding Securities may declare the
principal of and accrued but unpaid interest on all the Securities to be due and payable. If an
Event of Default relating to certain events of bankruptcy, insolvency or reorganization of the
Company occurs, the principal of and interest on all the Securities will become immediately due and
payable without any declaration or other act on the part of the Trustee or any Securityholder.

11. No Recourse Against Others

     A director, officer, employee or stockholder, as such, of the Company shall not have any
liability for any obligations of the Company under the Securities or the Indenture or for any claim
based on, in respect of or by reason of such obligations or their creation. By accepting a
Security, each Securityholder waives and releases all such liability. The waiver and release are
part of the consideration for the issue of the Securities.

12. Authentication

     This Security shall not be valid until an authorized signatory of the Trustee (or an
authenticating agent) manually signs the certificate of authentication on the other side of this
Security.

13. Abbreviations

 

 

     Customary abbreviations may be used in the name of a Securityholder or an assignee, such as
TEN COM (=tenants in common), TEN ENT (=tenants by the entireties), JT TEN (=joint tenants with
rights of survivorship and not as tenants in common), CUST (=custodian), and U/G/M/A (=Uniform Gift
to Minors Act).

14. GOVERNING LAW

     THIS SECURITY SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF
NEW YORK.

15. CUSIP and ISIN Numbers

     Pursuant to a recommendation promulgated by the Committee on Uniform Securities Identification
Procedures, the Company has caused CUSIP and ISIN numbers to be printed on the Securities and has
directed the Trustee to use CUSIP and ISIN numbers in notices of redemption as a convenience to
Securityholders. No representation is made as to the accuracy of such numbers either as printed on
the Securities or as contained in any notice of redemption and reliance may be placed only on the
other identification numbers placed thereon.

     The Company will furnish to any Holder of Securities upon written request and without charge
to the Holder a copy of the Indenture which has in it the text of this Security.

 

 

CONVERSION NOTICE

			
	TO:	 	NUANCE COMMUNICATIONS, INC.

U.S. BANK NATIONAL ASSOCIATION, as Trustee

     The undersigned registered owner of this Security hereby irrevocably exercises the option to
convert this Security, or the portion thereof (which is $1,000 or a multiple thereof) below
designated, into, cash and shares of Common Stock of Nuance Communications, Inc., if any, in
accordance with the terms of the Indenture referred to in this Security, and directs that the check
in payment for cash and the shares, if any, issuable and deliverable upon such conversion,
deliverable upon conversion or for fractional shares and any Securities representing any
unconverted principal amount hereof, be issued and delivered to the registered Holder hereof unless
a different name has been indicated below. Capitalized terms used herein but not defined shall
have the meanings ascribed to such terms in the Indenture. If shares or any portion of this
Security not converted are to be issued in the name of a person other than the undersigned, the
undersigned will provide the appropriate information below and pay all transfer taxes payable with
respect thereto. Any amount required to be paid by the undersigned on account of interest
accompanies this Security.

Dated:                                         

	 	 	 	 	 
	 

	 	 	 	 
	 
	 	 	 	 
	 
	 	 	 	 
	 

	 	 	 	 
	 

	 	Signature(s)
	 	 
	 
	 	 	 	 
	 

	 	Signature(s) must be guaranteed by an
“eligible guarantor institution” meeting the
requirements of the Registrar, which
requirements include membership or
participation in the Security Transfer Agent
Medallion Program (“STAMP”) or such other
“signature guarantee program” as may be
determined by the Registrar in addition to,
or in substitution for, STAMP, all in
accordance with the Securities Exchange Act
of 1934, as amended.	 	 
	 
	 	 	 	 
	 
	 	 	 	 
	 

	 	 	 	 
	 

	 	Signature Guarantee	 	 

 

 

     Fill in the registration of shares of Common Stock, if any, if to be issued, and Securities,
if any, to be delivered, and the person to whom cash, if any, and payment for fractional shares, if
any, is to be made, if, other than to and in the name of the registered Holder:

	 	 	 
	Please print name and address

	 	 
	 
	 	 
	 
	 	 
	 	 	 
	(Name)
	 	 
	 
	 	 
	 
	 	 
	 	 	 
	(Street Address)
	 	 
	 
	 	 
	 
	 	 
	 	 	 
	(City, State and Zip Code)
	 	 
	 
	 	 
	Principal amount to be converted
	 	 
	  (if less than all, must be $1,000 or whole multiples thereof):
	 
	 	 
	$                                        
	 	 
	 
	 	 
	Social Security or Other Taxpayer
	 	 
	  Identification Number:
	 	 
	 
	 	 
	 
	 	 
	 	 	 

NOTICE: The signature on this Conversion Notice must correspond with the name as written upon the
face of the Securities in every particular without alteration or enlargement or any change
whatever.

 

 

REPURCHASE NOTICE/FUNDAMENTAL CHANGE REPURCHASE NOTICE

			
	TO:	 	NUANCE COMMUNICATIONS, INC.

U.S. BANK NATIONAL ASSOCIATION, as Trustee

     The undersigned registered owner of this Security hereby irrevocably acknowledges receipt of a
notice from Nuance Communications, Inc. (the “Company”) regarding the right of Holders to elect to
require the Company to repurchase the Securities and requests and instructs the Company to repay
the entire principal amount of this Security, or the portion thereof (which is $1,000 or an
integral multiple thereof) below designated, in accordance with the terms of the Indenture at the
price of 100% of such entire principal amount or portion thereof, together with accrued and unpaid
interest to, but excluding, the Repurchase Date or the Fundamental Change Repurchase Date, as the
case may be, to the registered Holder hereof. Capitalized terms used herein but not defined shall
have the meanings ascribed to such terms in the Indenture. The Securities shall be repurchased by
the Company as of the Repurchase Date or the Fundamental Change Repurchase Date, as the case may
be, pursuant to the terms and conditions specified in the Indenture.

Dated:                                         

Signature(s):                                         

                                        

NOTICE: The above signatures of the Holder(s) hereof must correspond with the name as written upon
the face of the Securities in every particular without alteration or enlargement or any change
whatever.

     Securities Certificate Number (if applicable):                                         

     Principal amount to be repurchased (if less than all, must be $1,000 or whole multiples
thereof):                                         

     Social Security or Other Taxpayer Identification Number:                     

 

 

ASSIGNMENT

     For value received                                          hereby sell(s) assign(s) and
transfer(s) unto                                          (Please insert social security or other
Taxpayer Identification Number of assignee) the within Securities, and hereby irrevocably
constitutes and appoints                                          attorney to transfer said
Securities on the books of the Company, with full power of substitution in the premises.

     In connection with any transfer of the Securities prior to the expiration of the holding
period applicable to sales thereof under Rule 144(k) under the Securities Act (or any successor
provision) (other than any transfer pursuant to a registration statement that has been declared
effective under the Securities Act), the undersigned confirms that such Securities are being
transferred:

	o	 	To Nuance Communications, Inc. or a subsidiary thereof; or
	 
	o	 	To a “qualified institutional buyer” in compliance with Rule 144A
under the Securities Act of 1933, as amended; or
	 
	o	 	Pursuant to a Registration Statement which has been declared effective
under the Securities Act of 1933, as amended, and which continues to
be effective at the time of transfer;

and unless the Securities has been transferred to Nuance Communications, Inc. or a subsidiary
thereof, the undersigned confirms that such Securities are not being transferred to an “affiliate”
of the Company as defined in Rule 144 under the Securities Act of 1933, as amended.

Unless one of the boxes is checked, the Trustee will refuse to register any of the Securities
evidenced by this certificate in the name of any person other than the registered Holder thereof.

 

 

Dated:                                         

	 	 	 	 	 
	 

	 	 	 	 
	 
	 	 	 	 
	 
	 	 	 	 
	 

	 	 	 	 
	 

	 	Signature(s)
	 	 
	 
	 	 	 	 
	 

	 	Signature(s) must be guaranteed by an
“eligible guarantor institution” meeting the
requirements of the Registrar, which
requirements include membership or
participation in the Security Transfer Agent
Medallion Program (“STAMP”) or such other
“signature guarantee program” as may be
determined by the Registrar in addition to,
or in substitution for, STAMP, all in
accordance with the Securities Exchange Act
of 1934, as amended.	 	 
	 
	 	 	 	 
	 
	 	 	 	 
	 

	 	 	 	 
	 

	 	Signature Guarantee	 	 

NOTICE: The signature on this Assignment must correspond with the name as written upon the face of
the Securities in every particular without alteration or enlargement or any change whatever.

 

 

SCHEDULE OF INCREASES AND DECREASES IN GLOBAL SECURITY3

     The following increases or decreases in this Global Security have been made:

	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	 	 	Amount of decrease in	 	 	Amount of increase in	 	 	Principal Amount of this	 	 	Signature of authorized	 
	 	 	Principal Amount of this	 	 	Principal Amount of this	 	 	Global Security following	 	 	signatory of Trustee or	 
	Date	 	Global Security	 	 	Global Security	 	 	such decrease or increase	 	 	Securities Custodian	 
	 
	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 

 

			
	3	 	For Global Securities only.

 

 

EXHIBIT B

FORM OF RESTRICTIVE LEGEND FOR

COMMON STOCK ISSUED UPON CONVERSION4

     THE SECURITIES EVIDENCED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED (THE “SECURITIES ACT”), OR ANY STATE SECURITIES LAWS. NEITHER THE SECURITIES NOR ANY
INTEREST OR PARTICIPATION HEREIN OR THEREIN MAY BE REOFFERED, SOLD, ASSIGNED, TRANSFERRED, PLEDGED,
ENCUMBERED OR OTHERWISE DISPOSED OF IN THE ABSENCE OF SUCH REGISTRATION OR UNLESS SUCH TRANSACTION
IS EXEMPT FROM, OR NOT SUBJECT TO, REGISTRATION UNDER THE SECURITIES ACT.

     BY ITS ACQUISITION HEREOF, THE HOLDER AGREES TO OFFER, SELL OR OTHERWISE TRANSFER SUCH
SECURITIES PRIOR TO THE DATE WHICH IS TWO YEARS AFTER THE LATER OF THE ORIGINAL ISSUE DATE HEREOF
AND THE LAST DATE ON WHICH NUANCE COMMUNICATIONS, INC. (THE “COMPANY”) OR ANY AFFILIATE OF THE
COMPANY WAS THE OWNER OF THIS SECURITY (OR ANY PREDECESSOR OF THIS SECURITY) (THE “RESALE
RESTRICTION TERMINATION DATE”) ONLY (A) TO THE COMPANY OR ANY SUBSIDIARY THEREOF, (B) PURSUANT TO A
REGISTRATION STATEMENT WHICH HAS BEEN DECLARED EFFECTIVE UNDER THE SECURITIES ACT, (C) FOR SO LONG
AS THE SECURITIES ARE ELIGIBLE FOR RESALE PURSUANT TO RULE 144A UNDER THE SECURITIES ACT (“RULE
144A”), TO A PERSON IT REASONABLY BELIEVES IS A “QUALIFIED INSTITUTIONAL BUYER” AS DEFINED IN RULE
144A THAT PURCHASES FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL BUYER TO
WHOM NOTICE IS GIVEN THAT THE TRANSFER IS BEING MADE IN RELIANCE ON RULE 144A, (D) PURSUANT TO
ANOTHER AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT, AND AGREES
THAT IT WILL GIVE TO EACH PERSON TO WHOM THIS SECURITY IS TRANSFERRED A NOTICE SUBSTANTIALLY TO THE
EFFECT OF THIS LEGEND; PROVIDED THAT THE COMPANY AND ITS TRANSFER AGENT SHALL HAVE THE RIGHT PRIOR
TO ANY SUCH OFFER, SALE OR TRANSFER PURSUANT TO CLAUSE (D) TO REQUIRE THE DELIVERY OF AN OPINION OF
COUNSEL, CERTIFICATION

 

 

AND/OR OTHER INFORMATION SATISFACTORY TO EACH OF THEM. THIS LEGEND WILL BE
REMOVED UPON THE REQUEST OF THE
HOLDER AFTER THE RESALE RESTRICTION TERMINATION DATE.exv10w1

 

EXHIBIT
10.1

NUANCE COMMUNICATIONS, INC.

2.75% Senior Convertible Debentures due 2027

REGISTRATION RIGHTS AGREEMENT

August 13, 2007

Citigroup Global Markets Inc.

Goldman, Sachs & Co.

As Representatives of the Initial Purchasers

c/o Citigroup Global Markets Inc.

388 Greenwich Street

New York, New York 10013

c/o Goldman Sachs & Co.

85 Broad Street

New York, New York 10004

Ladies and Gentlemen:

     Nuance Communications, Inc., a corporation organized under the laws of Delaware (the
“Company”), proposes to issue and sell to certain purchasers (the “Initial Purchasers”), for whom
you (the “Representatives”) are acting as representatives, its 2.75% Senior Convertible Debentures
due 2027 (the “Debentures”), upon the terms set forth in the Purchase Agreement between the Company
and the Representatives dated August 7, 2007 (the “Purchase Agreement”) relating to the initial
placement (the “Initial Placement”) of the Debentures. The Debentures are convertible into shares
of common stock, par value U.S.$0.001 per share (the “Common Stock”), of the Company pursuant to
the terms of the indenture (the “Indenture”), dated the date hereof, between the Company and U.S.
Bank National Association, as trustee (the “Trustee”). The Debentures and the Common Stock
issuable upon conversion of the Debentures are referred to herein as the “Securities”. To induce
the Initial Purchasers to enter into the Purchase Agreement and to satisfy a condition to your
obligations thereunder, the Company agrees with you for your benefit and the benefit of the holders
from time to time of the Securities (including the Initial Purchasers) (each a “Holder” and,
collectively, the “Holders”), as follows:

     1. Definitions. Capitalized terms used herein without definition shall have their
respective meanings set forth in the Purchase Agreement. As used in this Agreement, the following
capitalized defined terms shall have the following meanings:

     “Act” shall mean the Securities Act of 1933, as amended, and the rules and regulations of the
Commission promulgated thereunder.

 

 

     “Additional Interest” shall have the meaning set forth in Section 6 hereof.

     “Affiliate” shall have the meaning specified in Rule 405 under the Act and the terms
“controlling” and “controlled” shall have meanings correlative thereto.

     “Broker-Dealer” shall mean any broker or dealer registered as such under the Exchange Act.

     “Business Day” shall mean any day other than a Saturday, a Sunday or a legal holiday or a day
on which banking institutions or trust companies are authorized or obligated by law to close in New
York City or Delaware.

     “Closing Date” shall mean the date of the first issuance of the Securities.

     “Commission” shall mean the Securities and Exchange Commission.

     “Deferral Period” shall have the meaning indicated in Section 3(i) hereof.

     “Exchange Act” shall mean the Securities Exchange Act of 1934, as amended, and the rules and
regulations of the Commission promulgated thereunder.

     “Final Memorandum” shall mean the offering memorandum, dated August 7, 2007, relating to the
Securities, including any and all exhibits thereto and any information incorporated by reference
therein as of such date.

     “Holder” shall have the meaning set forth in the preamble hereto.

     “Indenture” shall mean the Indenture relating to the Securities, dated as of August 13, 2007,
between the Company and U.S. Bank National Association, as trustee, as the same may be amended from
time to time in accordance with the terms thereof.

     “Initial Placement” shall have the meaning set forth in the preamble hereto.

     “Initial Purchaser” shall have the meaning set forth in the preamble hereto.

     “Losses” shall have the meaning set forth in Section 5(d) hereof.

     “Majority Holders” shall mean, on any date, Holders of a majority of the aggregate principal
amount of Securities registered under a Registration Statement.

     “NASD Rules” shall mean the Conduct Rules and the By-Laws of the National Association of
Securities Dealers, Inc.

     “Notice and Questionnaire” shall mean a written notice delivered to the Company substantially
in the form attached as Annex A to the Final Memorandum.

     “Notice Holder” shall mean, on any date, any Holder of Registrable Securities that has
delivered a Notice and Questionnaire to the Company on or prior to such date.

2

 

     “Prospectus” shall mean a prospectus included in the Shelf Registration Statement (including,
without limitation, a prospectus that discloses information previously omitted from a prospectus
filed as part of an effective registration statement in reliance upon Rule 430A under the Act), as
amended or supplemented by any prospectus supplement, with respect to the terms of the offering of
any portion of the Securities covered by the Shelf Registration Statement, and all amendments and
supplements thereto, including any and all exhibits thereto and any information incorporated by
reference therein.

     “Purchase Agreement” shall have the meaning set forth in the preamble hereto.

     “Registrable Securities” shall mean Securities other than those that (A) have been (i)
registered under the Shelf Registration Statement and disposed of in accordance therewith, (ii)
have been distributed to the public pursuant to Rule 144 under the Act or any successor rule or
regulation thereto that may be adopted by the Commission or (iii) with respect to which the holding
period that would be applicable thereto under Rule 144(k) has expired and (B) as a result of the
event or circumstance described in any of the foregoing clauses (A)(i) through (A)(iii), the legend
with respect to transfer restrictions required under the Indenture is removed or removable in
accordance with the terms of the Indenture or such legend, as the case may be.

     “Securities” shall have the meaning set forth in the preamble hereto.

     “Shelf Registration Period” shall have the meaning set forth in Section 2(b) hereof.

     “Shelf Registration Statement” shall mean a “shelf” registration statement of the Company
pursuant to the provisions of Section 2 hereof which covers some or all of the Securities on an
appropriate form under Rule 415 under the Act, or any similar rule that may be adopted by the
Commission, amendments and supplements to such registration statement, including post-effective
amendments, in each case including the Prospectus contained therein, all exhibits thereto and all
material incorporated by reference therein.

     “Trustee” shall mean the trustee with respect to the Securities under the Indenture.

     “Trust Indenture Act” shall mean the Trust Indenture Act of 1939, as amended, and the rules
and regulations of the Commission promulgated thereunder.

     2. Shelf Registration. (a) The Company shall file with the Commission a Shelf
Registration Statement, or designate an effective Shelf Registration Statement, providing for the
registration of, and the sale on a continuous or delayed basis by the Holders of, all of the
Registrable Securities, from time to time, pursuant to Rule 415 under the Act or any similar rule
that may be adopted by the Commission and shall use its commercially reasonable efforts to cause
the Shelf Registration Statement to become or be declared effective under the Act as promptly as is
reasonably practicable after filing the Shelf Registration Statement, but in no event later than
180 days after the Closing Date.

     (b) The Company shall use its commercially reasonable efforts to keep the Shelf Registration
Statement continuously effective, supplemented and amended as required by the Act, in order to
permit the Prospectus forming part thereof to be usable by Holders for a period

3

 

(the “Shelf Registration Period”) from the date the Shelf Registration Statement is declared
effective by the Commission until the earlier of (i) two years after the last date of original
issuance of the Securities, (ii) the sale under the Shelf Registration Statement of all Registrable
Securities, (iii) the expiration of the holding period applicable to the Registrable Securities
held by persons that are not our affiliates under Rule 144(k) of the Act or any similar rule that
may be adopted by the Commission, or (iv) the date upon which there are no Registrable Securities
outstanding.

     (c) The Company shall cause the Shelf Registration Statement and the related Prospectus and
any amendment or supplement thereto, as of the effective date of the Shelf Registration Statement
or such amendment or supplement, (i) to comply in all material respects with the applicable
requirements of the Act; and (ii) not to contain any untrue statement of a material fact or omit to
state a material fact required to be stated therein or necessary in order to make the statements
therein (in the case of the Prospectus, in the light of the circumstances under which they were
made) not misleading.

     (d) Each Holder of Registrable Securities agrees to deliver a Notice and Questionnaire to the
Company at least five Business Days prior to any distribution by it of Registrable Securities under
the Shelf Registration Statement. From and after the date the Shelf Registration Statement is
declared effective, the Company shall, within 20 Business Days after such date, (i) if required by
applicable law, file with the Commission a post-effective amendment to the Shelf Registration
Statement or prepare and, if required by applicable law, file a supplement to the related
Prospectus or a amendment or supplement to any document incorporated therein by reference or file
any other required document so that the Holder delivering such Notice and Questionnaire is named as
a selling holder in the Shelf Registration Statement and the related Prospectus and so that such
Holder is permitted to deliver such Prospectus to purchasers of the Registrable Securities in
accordance with applicable law and, if the Company shall file a post-effective amendment to the
Shelf Registration Statement, use commercially reasonable efforts to cause such post-effective
amendment to be declared effective under the Act as promptly as is practicable; (ii) provide such
Holder copies of any documents filed pursuant to Section 2(d)(i) hereof; and (iii) notify such
Holder as promptly as practicable after the effectiveness under the Act of any post-effective
amendment filed pursuant to Section 2(d)(i) hereof; provided, that if such Notice and
Questionnaire is delivered during a Deferral Period, the Company shall so inform the Holder
delivering such Notice and Questionnaire and shall take the actions set forth in clauses (i), (ii)
and (iii) above within five Business Days of the expiration of the Deferral Period in accordance
with Section 3(i) hereof. Notwithstanding anything contained herein to the contrary, the Company
shall be under no obligation to name any Holder that is not a Notice Holder as a selling holder in
the Shelf Registration Statement or related Prospectus; provided, however, that any
Holder that becomes a Notice Holder pursuant to the provisions of this Section 2(d) (whether or not
such Holder was a Notice Holder at the time the Shelf Registration Statement was declared
effective) shall be named as a selling holder in the Shelf Registration Statement or related
Prospectus in accordance with the requirements of this Section 2(d).

4

 

     3. Registration Procedures. The following provisions shall apply in connection with
the Shelf Registration Statement.

     (a) The Company shall:

     (i) furnish to each of the Representatives and to counsel for the
Representatives, not less than five Business Days prior to the filing thereof with
the Commission, a copy of the Shelf Registration Statement and each amendment
thereof and each amendment or supplement, if any, to the Prospectus included therein
and shall use its commercially reasonable efforts to reflect in each such document,
when so filed with the Commission, such comments as the Representatives reasonably
propose; and

     (ii) include information regarding the Notice Holders and the methods of
distribution they have elected for their Registrable Securities provided to the
Company in Notices and Questionnaires as necessary to permit such distribution by
the methods specified therein.

     (b) The Company shall ensure that:

     (i) the Shelf Registration Statement and any amendment thereto and any
Prospectus forming part thereof and any amendment or supplement thereto complies in
all material respects with the Act; and

     (ii) the Shelf Registration Statement and any amendment thereto does not, when
it becomes effective, contain an untrue statement of a material fact or omit to
state a material fact required to be stated therein or necessary to make the
statements therein not misleading.

     (c) The Company shall advise the Representatives and each Notice Holder, and confirm such
advice by notice in writing (which notice pursuant to clauses (ii)-(v) hereof shall be accompanied
by an instruction to suspend the use of the Prospectus until the Company shall have remedied the
basis for such suspension):

     (i) when the Shelf Registration Statement and any amendment thereto has been
filed with the Commission and when the Shelf Registration Statement or any
post-effective amendment thereto has become effective;

     (ii) of any request by the Commission for any amendment or supplement to the
Shelf Registration Statement or the Prospectus or for additional information;

     (iii) of the issuance by the Commission of any stop order suspending the
effectiveness of the Shelf Registration Statement or the institution or threatening
of any proceeding for that purpose;

     (iv) of the receipt by the Company of any notification with respect to the
suspension of the qualification of the Securities included in the Shelf

5

 

Registration Statement for sale in any jurisdiction or the institution or
threatening of any proceeding for such purpose; and

     (v) of the happening of any event that, in the Company’s reasonable judgment,
requires any change in the Shelf Registration Statement or the Prospectus so that,
as of such date, they (A) do not contain any untrue statement of a material fact and
(B) do not omit to state a material fact required to be stated therein or necessary
to make the statements therein (in the case of the Prospectus, in the light of the
circumstances under which they were made) not misleading.

     (d) The Company shall use its commercially reasonable efforts to prevent the issuance of any
order suspending the effectiveness of the Shelf Registration Statement or the qualification of the
securities therein for sale in any jurisdiction and, if issued, to use its commercially reasonable
efforts to obtain as soon as possible the withdrawal thereof.

     (e) The Company shall furnish upon request to each Notice Holder, without charge, at least one
copy of the Shelf Registration Statement and any post-effective amendment thereto, including all
material incorporated therein by reference, and, if a Notice Holder so requests in writing, all
exhibits thereto (including exhibits incorporated by reference therein).

     (f) During the Shelf Registration Period, the Company shall promptly deliver to each Initial
Purchaser, each Notice Holder, and any sales or placement agents acting on their behalf, without
charge, as many copies of the Prospectus (including the preliminary Prospectus) included in the
Shelf Registration Statement and any amendment or supplement thereto as any such person may
reasonably request. The Company consents to the use of the Prospectus or any amendment or
supplement thereto by each of the foregoing in connection with the offering and sale of the
Securities.

     (g) Prior to any offering of Securities pursuant to the Shelf Registration Statement, the
Company shall use its commercially reasonable efforts to arrange for the qualification of the
Securities for sale under the laws of such jurisdictions as any Notice Holder shall reasonably
request and shall use its commercially reasonable efforts to maintain such qualification in effect
so long as required; provided that in no event shall the Company be obligated to qualify to
do business in any jurisdiction where it is not then so qualified or to take any action that would
subject it to service of process in suits, other than those arising out of the Initial Placement or
any offering pursuant to the Shelf Registration Statement, in any jurisdiction where it is not then
so subject.

     (h) Upon the occurrence of any event contemplated by subsections (c)(ii) through (v) above,
the Company shall use its commercially reasonable efforts to promptly (or within the time period
provided for by Section 3(i) hereof, if applicable) prepare a post-effective amendment to the Shelf
Registration Statement or an amendment or supplement to the related Prospectus or file any other
required document so that, as thereafter delivered to Initial Purchasers of the securities included
therein, the Prospectus will not include an untrue statement of a material fact or omit to state
any material fact required to be stated therein or necessary to make the statements therein, in the
light of the circumstances under which they were made, not misleading.

6

 

     (i) Upon the occurrence or existence of any pending corporate development, public filing with
the Commission or any other material event that, in the reasonable judgment of the Company, makes
it appropriate to suspend the availability of the Shelf Registration Statement and the related
Prospectus, the Company shall give notice (without notice of the nature or details of such events)
to the Notice Holders that the availability of the Shelf Registration is suspended and, upon actual
receipt of any such notice, each Notice Holder agrees not to sell any Registrable Securities
pursuant to the Shelf Registration Statement until such Notice Holder’s receipt of copies of the
supplemented or amended Prospectus provided for in Section 3(h) hereof, or until it is advised in
writing by the Company that the Prospectus may be used, and has received copies of any additional
or supplemental filings that are incorporated or deemed incorporated by reference in such
Prospectus. The period during which the availability of the Shelf Registration and any Prospectus
is suspended (the “Deferral Period”) shall not exceed 45 days in any 90-day period or 90 days in
any 360-day period, provided, however, in the event that the Company determines in
good faith that the disclosure of a previously undisclosed proposed or pending material business
transaction would be reasonably likely to impede its ability to consummate such transaction, it may
extend the Deferral Period from 45 days to 60 days in any 90-day period.

     (j) Not later than the effective date of the Shelf Registration Statement, the Company shall
provide a CUSIP number for the Securities registered under the Shelf Registration Statement and
provide the Trustee with printed certificates for such Securities, free of any restrictive legends,
in a form eligible for deposit with the Trustee as custodian for The Depository Trust Company.

     (k) The Company shall comply with all applicable rules and regulations of the Commission and
shall make generally available to the Holders an earnings statement satisfying the provisions of
Section 11(a) of the Act as soon as practicable after the effective date of the Shelf Registration
Statement and in any event no later than 45 days after the end of a 12-month period (or 90 days, if
such period is a fiscal year) (or such longer period as may be permitted under the Exchange Act)
beginning with the first month of the Company’s first fiscal quarter commencing after the effective
date of the Shelf Registration Statement.

     (l) The Company shall cause the Indenture to be qualified under the Trust Indenture Act in a
timely manner.

     (m) In addition to the Notice and Questionnaire, the Company may require each Holder of
Securities to be sold pursuant to the Shelf Registration Statement to furnish to the Company such
information regarding the Holder and the distribution of such Securities as the Company may from
time to time reasonably require for inclusion in the Shelf Registration Statement. The Company may
exclude from the Shelf Registration Statement the Securities of any Holder that fails to furnish
such information or respond to such request within a reasonable time after receiving such request.

     (n) The Company shall use its commercially reasonable efforts, if the Securities have been
rated prior to the initial sale of such Securities, to confirm such ratings will apply to the
Securities covered by the Shelf Registration Statement.

7

 

     (o) The Company shall use its commercially reasonable efforts at all times, except as provided
in Section 3(i), to take all other steps necessary to effect and maintain the registration of the
Registrable Securities covered by the Shelf Registration Statement.

     4. Registration Expenses. The Company shall bear all expenses incurred in connection
with the performance of its obligations under Sections 2 and 3 hereof and shall reimburse the
Holders for the reasonable fees and disbursements of one firm or counsel (which shall initially be
Davis Polk & Wardwell, but which may be another nationally recognized law firm experienced in
securities matters designated by the Majority Holders to act as counsel for the Holders in
connection therewith).

     5. Indemnification and Contribution. (a) The Company agrees to indemnify and hold
harmless each Holder of Securities covered by the Shelf Registration Statement, each Initial
Purchaser, the directors, officers, employees, Affiliates and agents of each such Holder or Initial
Purchaser and each person who controls any such Holder or Initial Purchaser within the meaning of
either the Act or the Exchange Act against any and all losses, claims, damages or liabilities,
joint or several, to which they or any of them may become subject under the Act, the Exchange Act
or other federal or state statutory law or regulation, at common law or otherwise, insofar as such
losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based
upon any untrue statement or alleged untrue statement of a material fact contained in the Shelf
Registration Statement as originally filed or in any amendment thereof, or in any preliminary
Prospectus or the Prospectus, or in any amendment thereof or supplement thereto, or arise out of or
are based upon the omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements therein (in the case of any preliminary
Prospectus or the Prospectus, in the light of the circumstances under which they were made) not
misleading, and agrees to reimburse each such indemnified party, as incurred, for any legal or
other expenses reasonably incurred by it in connection with investigating or defending any such
loss, claim, damage, liability or action; provided, however, that the Company will
not be liable in any such case to the extent that any such loss, claim, damage or liability arises
out of or is based upon any such untrue statement or alleged untrue statement or omission or
alleged omission made therein in reliance upon and in conformity with written information furnished
to the Company by or on behalf of the party claiming indemnification specifically for inclusion
therein. This indemnity agreement shall be in addition to any liability that the Company may
otherwise have.

     (b) Each Holder of securities covered by the Shelf Registration Statement (including each
Initial Purchaser that is a Holder, in such capacity) severally and not jointly agrees to indemnify
and hold harmless the Company, each of its directors, each of its officers who signs the Shelf
Registration Statement and each person who controls the Company within the meaning of either the
Act or the Exchange Act, to the same extent as the foregoing indemnity from the Company to each
such Holder, but only with reference to written information relating to such Holder furnished to
the Company by or on behalf of such Holder specifically for inclusion in the documents referred to
in the foregoing indemnity. This indemnity agreement shall be acknowledged by each Notice Holder
that is not an Initial Purchaser in such Notice Holder’s Notice and Questionnaire and shall be in
addition to any liability that any such Notice Holder may otherwise have.

8

 

     (c) Promptly after receipt by an indemnified party under this Section 5 or notice of the
commencement of any action, such indemnified party will, if a claim in respect thereof is to be
made against the indemnifying party under this Section 5, notify the indemnifying party in writing
of the commencement thereof; but the failure so to notify the indemnifying party (i) will not
relieve it from liability under paragraph (a) or (b) above unless and to the extent it did not
otherwise learn of such action and such failure results in the forfeiture by the indemnifying party
of substantial rights and defenses; and (ii) will not, in any event, relieve the indemnifying party
from any obligations to any indemnified party other than the indemnification obligation provided in
paragraph (a) or (b) above. The indemnifying party shall be entitled to appoint counsel (including
local counsel) of the indemnifying party’s choice at the indemnifying party’s expense to represent
the indemnified party in any action for which indemnification is sought (in which case the
indemnifying party shall not thereafter be responsible for the fees and expenses of any separate
counsel, other than local counsel if not appointed by the indemnifying party, retained by the
indemnified party or parties except as set forth below); provided, however, that such counsel shall
be satisfactory to the indemnified party. Notwithstanding the indemnifying party’s election to
appoint counsel (including local counsel) to represent the indemnified party in an action, the
indemnified party shall have the right to employ separate counsel (including local counsel), and
the indemnifying party shall bear the reasonable fees, costs and expenses of such separate counsel
if (i) the use of counsel chosen by the indemnifying party to represent the indemnified party would
present such counsel with a conflict of interest; (ii) the actual or potential defendants in, or
targets of, any such action include both the indemnified party and the indemnifying party and the
indemnified party shall have reasonably concluded that there may be legal defenses available to it
and/or other indemnified parties that are different from or additional to those available to the
indemnifying party; (iii) the indemnifying party shall not have employed counsel satisfactory to
the indemnified party to represent the indemnified party within a reasonable time after notice of
the institution of such action; or (iv) the indemnifying party shall authorize the indemnified
party to employ separate counsel at the expense of the indemnifying party. An indemnifying party
will not, without the prior written consent of the indemnified parties, settle or compromise or
consent to the entry of any judgment with respect to any pending or threatened claim, action, suit
or proceeding in respect of which indemnification or contribution may be sought hereunder (whether
or not the indemnified parties are actual or potential parties to such claim or action) unless such
settlement, compromise or consent (i) includes an unconditional release of each indemnified party
from all liability arising out of such claim, action, suit or proceeding and (ii) does not include
a statement as to, or an admission of, fault, culpability or a failure to act, by or on behalf of
any indemnified party.

     (d) In the event that the indemnity provided in paragraph (a) or (b) of this Section 5 is
unavailable to or insufficient to hold harmless an indemnified party for any reason, then each
applicable indemnifying party shall have a joint and several obligation to contribute to the
aggregate losses, claims, damages and liabilities (including legal or other expenses reasonably
incurred in connection with investigating or defending loss, claim, liability, damage or action)
(collectively “Losses”) to which such indemnified party may be subject in such proportion as is
appropriate to reflect the relative benefits received by such indemnifying party, on the one hand,
and such indemnified party, on the other hand, from the Initial Placement and the Shelf
Registration Statement which resulted in such Losses; provided, however, that in no
case shall any Initial Purchaser be responsible, in the aggregate, for any amount in excess of the
purchase discount or commission applicable to such Security, as set forth in the Final Memorandum.
If

9

 

the allocation provided by the immediately preceding sentence is unavailable for any reason,
the indemnifying party and the indemnified party shall contribute in such proportion as is
appropriate to reflect not only such relative benefits but also the relative fault of such
indemnifying party, on the one hand, and such indemnified party, on the other hand, in connection
with the statements or omissions which resulted in such Losses as well as any other relevant
equitable considerations. Benefits received by the Company shall be deemed to be equal to the
total net proceeds from the Initial Placement (before deducting expenses) as set forth in the Final
Memorandum. Benefits received by the Initial Purchasers shall be deemed to be equal to the total
purchase discounts and commissions as set forth on the cover page of the Final Memorandum, and
benefits received by any other Holders shall be deemed to be equal to the value of receiving
Securities registered under the Act. Relative fault shall be determined by reference to, among
other things, whether any untrue or any alleged untrue statement of a material fact or omission or
alleged omission to state a material fact relates to information provided by the indemnifying
party, on the one hand, or by the indemnified party, on the other hand, the intent of the parties
and their relative knowledge, access to information and opportunity to correct or prevent such
untrue statement or omission. The parties agree that it would not be just and equitable if
contribution were determined by pro rata allocation (even if the Holders were treated as one entity
for such purpose) or any other method of allocation which does not take account of the equitable
considerations referred to above. Notwithstanding the provisions of this paragraph (d), no person
guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Act) shall be
entitled to contribution from any person who was not guilty of such fraudulent misrepresentation.
For purposes of this Section 5, each person who controls a Holder within the meaning of either the
Act or the Exchange Act and each director, officer, employee and agent of such Holder shall have
the same rights to contribution as such Holder, and each person who controls the Company within the
meaning of either the Act or the Exchange Act, each officer of the Company who shall have signed
the Shelf Registration Statement and each director of the Company shall have the same rights to
contribution as the Company, subject in each case to the applicable terms and conditions of this
paragraph (d).

     (e) The provisions of this Section 5 shall remain in full force and effect, regardless of any
investigation made by or on behalf of any Holder or the Company or any of the indemnified persons
referred to in this Section 5, and shall survive the sale by a Holder of securities covered by the
Shelf Registration Statement.

     6. Registration Defaults. If any of the following events shall occur (each a
“Registration Default”), then the Company shall pay liquidated damages (the “Additional Interest”)
to the Holders of Securities in respect of the Securities as follows (it being agreed that the
Company will have no other liabilities for monetary damages with respect to any of the following
events):

     (a) if the Company has not designated an effective Shelf Registration Statement by the
180th day following the Closing Date, then if the Shelf Registration Statement is not
declared effective by the Commission on or prior to the 180th day following the Closing
Date (or the Shelf Registration Statement has not automatically become effective pursuant to Rule
462(e) upon a filing made on or prior to such 180th day), then commencing on the
181st day after the Closing Date, Additional Interest shall accrue on the Registrable
Securities at a rate of 0.25% per

10

 

annum for the first 90 days from and including such 181st day and 0.50% per annum
thereafter; or

     (b) if the Shelf Registration Statement has been declared effective but ceases to be effective
(other than pursuant to Section 3(i) hereof) at any time during the Shelf Registration Period and
we do not cure the Shelf Registration Statement within five Business Days by a post-effective
amendment or a report filed pursuant to the Act, then commencing on the day following the fifth
Business Day after the Shelf Registration Statement ceases to be effective, Additional Interest
shall accrue on the Registrable Securities at a rate of 0.25% per annum for the first 90 days from
and including such date on which the Shelf Registration Statement ceases to be effective and 0.50%
per annum thereafter; or

     (c) if the aggregate duration of Deferral Periods in any period exceeds the number of days
permitted in respect of such period pursuant to Section 3(i) hereof, then commencing on the day the
aggregate duration of Deferral Periods in any period exceeds the number of days permitted in
respect of such period, Additional Interest shall accrue on the Registrable Securities at a rate of
0.25% per annum for the first 90 days from and including such date and 0.50% per annum thereafter;

provided, however, that (1) upon the filing of the Shelf Registration Statement (in
the case of paragraph (a) above), (2) upon the effectiveness of the Shelf Registration Statement
(in the case of paragraph (b) above), (3) upon the effectiveness of the Shelf Registration
Statement which had ceased to remain effective (in the case of paragraph (c) above), or (4) upon
the termination of the Deferral Period that caused the limit on the aggregate duration of Deferral
Periods in a period set forth in Section 3(i) to be exceeded (in the case of paragraph (d) above),
Additional Interest shall cease to accrue; and provided further that in no event
will Additional Interest, together with any additional interest that accrues pursuant to Section
6.13 of the Indenture, accrue on the Debentures at a rate per annum exceeding 1.00%.

     (d) In no event will Additional Interest be payable in connection with a Registration Default
relating to a failure to register the Common Stock deliverable upon a conversion of the Debentures.
For the avoidance of doubt, in the case of a Registration Default with respect to the Debentures
included in the Registrable Securities, Additional Interest shall be payable in connection with
such Registration Default with respect to such Debentures.

     7. No Inconsistent Agreements. The Company has not entered into, and agrees not to
enter into, any agreement with respect to its securities that is inconsistent with the rights
granted to the Holders herein or that otherwise conflicts with the provisions hereof.

     8. Amendments and Waivers. The provisions of this Agreement may not be amended,
qualified, modified or supplemented, and waivers or consents to departures from the provisions
hereof may not be given, unless the Company has obtained the written consent of the Holders of a
majority of the aggregate principal amount of the Registrable Securities outstanding;
provided that, with respect to any matter that directly or indirectly affects the rights of
any Initial Purchaser hereunder, the Company shall obtain the written consent of each such Initial
Purchaser against which such amendment, qualification, supplement, waiver or consent is to be
effective; provided, further, that no amendment, qualification, supplement, waiver
or

11

 

consent with respect to Section 6 hereof shall be effective as against any Holder of
Registered Securities unless consented to in writing by such Holder; and provided,
further, that the provisions of this Article 8 may not be amended, qualified, modified or
supplemented, and waivers or consents to departures from the provisions hereof may not be given,
unless the Company has obtained the written consent of the Initial Purchasers and each Holder.

     9. Notices. All notices and other communications provided for or permitted hereunder
shall be made in writing by hand-delivery, first-class mail, telex, telecopier or air courier
guaranteeing overnight delivery:

     (a) if to a Holder, at the most current address given by such holder to the Company in
accordance with the provisions of the Notice and Questionnaire, which address initially is, with
respect to each Holder, the address of such Holder maintained by the Registrar under the Indenture;

     (b) if to the Initial Purchasers or the Representatives, initially at the address or addresses
set forth in the Purchase Agreement; and

     (c) if to the Company, initially at its address set forth in the Purchase Agreement.

     All such notices and communications shall be deemed to have been duly given when received.

     The Initial Purchasers or the Company by notice to the other parties may designate additional
or different addresses for subsequent notices or communications.

     10. Remedies. Each Holder, in addition to being entitled to exercise all rights
provided to it herein, in the Indenture or in the Purchase Agreement or granted by law, including
recovery of liquidated or other damages, will be entitled to specific performance of its rights
under this Agreement. The Company agrees that monetary damages would not be adequate compensation
for any loss incurred by reason of a breach by it of the provisions of this Agreement and hereby
agrees to waive in any action for specific performance the defense that a remedy at law would be
adequate.

     11. Successors. This Agreement shall inure to the benefit of and be binding upon the
parties hereto, their respective successors and assigns, including, without the need for an express
assignment or any consent by the Company thereto, subsequent Holders of Securities, and the
indemnified persons referred to in Section 5 hereof. The Company hereby agrees to extend the
benefits of this Agreement to any Holder of Securities, and any such Holder may specifically
enforce the provisions of this Agreement as if an original party hereto.

     12. Counterparts. This Agreement may be signed in one or more counterparts, each of
which shall constitute an original and all of which together shall constitute one and the same
agreement.

     13. Headings. The section headings used herein are for convenience only and shall not
affect the construction hereof.

12

 

     14. Applicable Law. This Agreement shall be governed by and construed in accordance
with the laws of the State of New York applicable to contracts made and to be performed in the
State of New York. The parties hereto each hereby waive any right to trial by jury in any action,
proceeding or counterclaim arising out of or relating to this Agreement.

     15. Severability. In the event that any one of more of the provisions contained
herein, or the application thereof in any circumstances, is held invalid, illegal or unenforceable
in any respect for any reason, the validity, legality and enforceability of any such provision in
every other respect and of the remaining provisions hereof shall not be in any way impaired or
affected thereby, it being intended that all of the rights and privileges of the parties shall be
enforceable to the fullest extent permitted by law.

     16. Securities Held by the Company, etc. Whenever the consent or approval of Holders
of a specified percentage of principal amount of Securities is required hereunder, Securities held
by the Company or its Affiliates (other than subsequent Holders of Securities if such subsequent
Holders are deemed to be Affiliates solely by reason of their holdings of such Securities) shall
not be counted in determining whether such consent or approval was given by the Holders of such
required percentage.

13

 

     If the foregoing is in accordance with your understanding of our agreement, please sign and
return to us the enclosed duplicate hereof, whereupon this letter and your acceptance shall
represent a binding agreement between the Company and the several Initial Purchasers.

	 	 	 	 	 	 	 	 
	 	 	Very truly yours,	 	 
	 
	 	 	 	 	 	 
	 	 	Nuance Communications, Inc.	 	 
	 
	 	 	 	 	 	 
	 

	 	By:	/s/ James R. Arnold  
	 	 
	 

	 	 	
Name:  
	James R. Arnold 
	 

	 	 	Title:	Chief Financial Officer 

The foregoing Agreement is hereby confirmed

and accepted as of the date first above written.

Citigroup Global Markets Inc.

	 	 	 	 	 	 
	By:
	 	/s/ Pawan Adhikari 	 	 
	 

	 	 

Name:
	 	 
	 

	 	Title:	 	 
	 
	 	 	 	 
	Goldman, Sachs & Co.	 	 
	 
	 	 	 	 
	By:
	 	/s/ Goldman Sachs & Co. 	 	 
	 

	 	 

Name:
	 	 
	 

	 	Title:	 	 

Signature Page to Registration Rights Agreement

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