Document:

1982 STOCK OPTION PLAN

 Exhibit 10.A 
 MENTOR GRAPHICS CORPORATION 
 1982 STOCK OPTION PLAN 
 Mentor Graphics recognizes that its continuing success depends upon the initiative, ability and significant contributions of officers and
key employees. Mentor Graphics believes that by affording such employees the opportunity to purchase shares in Mentor Graphics it will enhance its ability to attract and retain such employees and will provide an incentive for them to exert their
best efforts on its behalf. 
 The Plan is as follows: 
 1. Shares Subject to the Plan.  
 1.1 Options and other awards granted under this Plan shall be for authorized but unissued or reacquired common stock of Mentor Graphics. 
 1.2 Options may be granted under paragraph 4 of the Plan, stock appreciation rights may be granted under paragraph 8.2 of the Plan,
restricted stock and restricted stock units may be granted under paragraph 9 of the Plan, and Performance-based Awards (as defined in paragraph 10 below) may be granted under paragraph 10 of the Plan for a total of not more than 32,670,000 shares of
common stock, subject to adjustment under paragraph 11. Shares subject to options, to stock appreciation rights granted under paragraph 8.2, to restricted stock units, and to Performance-based Awards that are terminated or expire without being
exercised, other than options that are surrendered on exercise of a stock appreciation right granted under paragraph 8.1, shall be added to the shares remaining for future awards under the Plan. If shares issued as restricted stock under paragraph 9
or pursuant to Performance-based Awards under paragraph 10 are forfeited to Mentor Graphics or repurchased by Mentor Graphics at original cost, the number of shares forfeited or repurchased shall be added to the shares remaining for future awards
under the Plan. 
 1.3 No employee may be granted options or stock appreciation rights under the Plan for more than an aggregate
of 500,000 shares of common stock in any calendar year. 
 2. Effective Date; Duration.  
 This Plan shall be effective January 1, 1982 and shall continue until all shares available for issuance under the Plan have been issued,
unless sooner terminated by the Board of Directors of Mentor Graphics (Board of Directors). Expiration or termination of the Plan shall not affect outstanding options, bonus rights, stock appreciation rights, restricted stock, restricted stock units
or Performance-based Awards. 
 3. Administration.  
 3.1 The Plan shall be administered by a compensation committee appointed by the Board of Directors (Committee). The Committee may delegate
any of its administrative duties to one or more agents and may retain advisors to assist it. 
 3.2 The Committee shall have
general responsibility to interpret and administer the Plan. Any decision by the Committee shall be final and bind all parties. Notwithstanding the foregoing, the Committee’s exclusive power to make final and binding interpretations of the Plan
shall immediately terminate upon the occurrence of a Change in Control (as defined in paragraph 7.2). The Committee shall keep adequate records of options, bonus rights, stock appreciation rights, restricted stock, restricted stock units and
Performance-based Awards granted under the Plan and shall be responsible for communication with award recipients. 
 3.3 No
Committee member shall participate in the decision of any question relating exclusively to an option, bonus right, stock appreciation right, restricted stock award or Performance-based Award granted to the member. 
 4. Grant of Options.  
 4.1 Options granted under the Plan may be either incentive stock options within the meaning of Section 422 of the Internal Revenue Code of 1986, as amended (the Code), or options other than incentive
stock options (nonqualified stock options). No incentive stock options may be granted under the Plan on or after the tenth anniversary of the last action by the Board of Directors approving an increase in the number of shares available for issuance
under the Plan, which action was subsequently approved within 12 months by the shareholders. 
  

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 4.2 Options may be granted to any officer or key employee of Mentor Graphics and any
subsidiary of Mentor Graphics and may be granted in substitution for outstanding options of another corporation by reason of merger, consolidation, acquisition of property or stock, or other reorganization between such other corporation and Mentor
Graphics or any subsidiary of Mentor Graphics. Additional options may be granted to existing optionees and may be granted in exchange for outstanding options. 
 4.3 The Committee shall designate persons to receive grants, and as to each option shall specify the number of shares, the option price and term, the time or times at which the option may be exercised,
whether the option is an incentive stock option or a nonqualified stock option and all other terms and conditions of the option. 
 4.4 No employee may be granted incentive stock options under the Plan such that the aggregate fair market value, on the date of grant, of the shares with regard to which incentive stock options are exercisable for the first time by that
employee during any calendar year under the Plan and under any other stock option plan of Mentor Graphics or any parent or subsidiary of Mentor Graphics exceeds $100,000. Fair market value shall be determined under subparagraph 5.1(c) as of the date
of each grant. 
 5. Option Terms.  
 5.1 The option price shall be fixed by the Committee as follows: 
 (a) Subject to (b) the option price for an incentive stock option shall be not less than the fair market value of the shares on the date of grant. The option price for a nonqualified stock option shall be not less than 50% of the fair
market value of the shares on the date of grant. 
 (b) If the optionee at the time of grant owns stock
possessing more than 10 percent of the combined voting power of all classes of stock of Mentor Graphics, the option price for an incentive stock option shall be not less than 110 percent of the fair market value of the shares on the date of grant.
Stock owned by the optionee shall include for this purpose, and for purposes of paragraph 5.2, stock attributed to the optionee pursuant to applicable provisions of the Code. 
 (c) “Fair market value” means an amount determined by, or in an manner approved by, the Committee. The Committee
may appoint and rely on one or more qualified independent appraisers to value the stock or use such other evaluation as it considers appropriate. 
 5.2 The Committee shall fix a time limit of not over 10 years after the date of grant for exercise of an incentive stock option. The Committee shall fix a time limit of not over 10 years plus seven days
after the date of grant for exercise of a nonqualified stock option. For a more than 10 percent shareholder the maximum limit for exercise of an incentive stock option shall be five years. The Committee may make the option exercisable in full
immediately or in graduated amounts over the option term. 
 5.3 The option shall be evidenced by a stock option agreement
executed by Mentor Graphics and the optionee in a form prescribed by the Committee. 
 5.4 The option may not be assigned or
transferred except (a) on death, by will or operation of law, or pursuant to a qualified domestic relations order as defined under the Code or Title I of the Employee Retirement Income Security Act or (b) with respect to nonqualified
options, as otherwise approved by the Committee. The option may be exercised only by the optionee or by a successor or representative after death, except as otherwise approved by the Committee with respect to nonqualified options. 
 5.5 Unless otherwise determined by the Committee, if an officer of Mentor Graphics subject to Section 16 of the Securities Exchange Act
of 1934 (1934 Act) exercises an option within six months of the grant of the option, the shares acquired upon exercise of the option may not be sold until six months after the date of grant of the option. 
 6. Bonus Rights.  
 6.1 The Committee may grant bonus rights in connection with nonqualified stock options granted under the Plan. Bonus rights may be granted with the related option or at a later time. A bonus right may not be assigned or

  

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transferred except on death, by will or operation of law, or pursuant to a qualified domestic relations order as defined under the Code or Title I of the Employee Retirement Income Security Act.
Bonus rights will be subject to such rules, terms, and conditions as the Committee may prescribe. 
 6.2 A bonus right will
entitle an optionee to a cash bonus in connection with the exercise in whole or in part of the related option. Subject to paragraph 6.3, the amount of the bonus shall be determined by multiplying the applicable bonus percentage by the amount by
which the fair market value, on the exercise date, of the shares received on exercise of the related option exceeds the option price. The cash bonus will be payable within 30 days following the date as of which its amount is determined. For the
purpose of this paragraph, fair market value shall be determined according to subparagraph 5.1(c). The bonus percentage applicable to a bonus right shall be determined by the Committee, but shall in no event exceed 100 percent. 
 6.3 The Committee may set a maximum dollar limit on the amount of cash to be paid under any bonus right. 
 7. Acceleration Upon Change in Control.  
 7.1 The Committee may grant acceleration rights to holders of options or stock appreciation rights which will provide that the options or stock appreciation rights will become exercisable in full for the
remainder of their terms upon the occurrence of a Change in Control. Acceleration rights may be granted with an option or stock appreciation right or at a later time by amendment of outstanding options or stock appreciation rights. 
 7.2 “Change in Control” means the occurrence of any of the following events, unless prior to the occurrence of the event, the
Committee determines that the specific event shall not be considered a Change in Control: 
 (a) the shareholders
of Mentor Graphics shall approve: 
 (i) any consolidation, merger or plan of share exchange involving Mentor
Graphics (Merger) in which Mentor Graphics is not the continuing or surviving corporation or pursuant to which shares of common stock would be converted into cash, securities or other property, other than a Merger involving Mentor Graphics in which
the holders of Mentor Graphics’ common stock immediately prior to the Merger have the same proportionate ownership of common stock of the surviving corporation immediately after the Merger; 
 (ii) any sale, lease, exchange or other transfer (in one transaction or a series of related transactions) of all, or
substantially all, the assets of Mentor Graphics; or 
 (iii) the adoption of any plan or proposal for the
liquidation or dissolution of Mentor Graphics; 
 (b) at any time during a period of two consecutive years,
individuals who at the beginning of such period constituted the Board of Directors (Incumbent Directors) shall cease for any reason to constitute at least a majority thereof, unless each new director elected during such two-year period was nominated
or elected by two-thirds of the Incumbent Directors then in office and voting (new directors nominated or elected by two-thirds of the Incumbent Directors shall also be deemed to be Incumbent Directors); or 
 (c) any person (as such term is used in Section 13(d) of the 1934 Act) shall, as a result of a tender or exchange offer,
open market purchases, privately negotiated purchases or otherwise, have become the beneficial owner (within the meaning of Rule 13d-3 under the 1934 Act), directly or indirectly, of securities of Mentor Graphics ordinarily having the right to vote
in the election of directors (Voting Securities) representing twenty percent (20%) or more of the combined voting power of the then outstanding Voting Securities. 
 8. Stock Appreciation Rights.  
 8.1 (a) The Committee, in its sole
discretion, may grant both “general” and “limited” stock appreciation rights with all or any part of an incentive stock option or a nonqualified stock option granted under the Plan. Stock appreciation rights may be granted with
the related option or at any later time during the term of the option. 
 (b) A general stock appreciation right
granted with all or any part of an option shall be exercisable only at the time or times established by the Committee and only to the extent that the related option could be exercised. A limited stock appreciation right shall be exercisable only
during the 60 calendar days immediately following a Change in Control and only if the immediate resale of shares acquired upon

  

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exercise of the related option would subject the optionee to liability under Section 16(b) of the 1934 Act; provided, however, that a limited stock appreciation right may not be exercised
within six months of its date of grant. Upon exercise of a stock appreciation right, the option or portion thereof to which the stock appreciation right relates must be surrendered. The shares subject to an option or portion thereof that is
surrendered upon exercise of a stock appreciation right shall not be available for future option or stock appreciation rights grants under the Plan. 
 (c) Each stock appreciation right granted with all or any part of an option shall entitle the holder to receive from Mentor Graphics an amount equal to the excess of the fair market value at the time of
exercise of one share of Mentor Graphics common stock over the option price per share under the related option, multiplied by the number of shares covered by the related option or portion of the related option. 
 (d) The terms of a limited stock appreciation right granted with a nonqualified stock option may provide, if so determined by
the Committee, that the fair market value of the common stock for purposes of subparagraph 8.1(c) shall be equal to the higher of: 
 (i) the highest reported sales price of the common stock during the 60-day period ending on the date the limited stock appreciation right is exercised; 
 (ii) the highest per share price paid for shares of common stock purchased in any tender or exchange offer during the 60
calendar days preceding the exercise of the limited stock appreciation right; 
 (iii) the fixed or formula
price to be received by holders of shares of common stock in or as a result of any transaction described in subparagraph 7.2(a) if such price is determinable on the date of exercise, provided that any securities or other property that are part of
the fixed or formula price shall be valued at the highest valuation placed on the securities or property in any communication to the shareholders of Mentor Graphics by any party to the transaction; and 
 (iv) the highest price per share shown on a Schedule 13D, or any amendment thereto, filed by the holder or holders of the
specified percentage of common stock whose acquisition gives rise to the exercisability of the limited stock appreciation right. 
 8.2 (a) The Committee may grant general stock appreciation rights without related options under the Plan to any officer or key employee of Mentor Graphics and any subsidiary of Mentor Graphics. Such stock appreciation rights may be
granted in substitution for outstanding stock appreciation rights of another corporation by reason of merger, consolidation, acquisition of property or stock, or other reorganization between such other corporation and Mentor Graphics or any
subsidiary of Mentor Graphics. Additional stock appreciation rights may be granted to existing holders of stock appreciation rights and may be granted in exchange for outstanding stock appreciation rights. 
 (b) The Committee shall designate persons to receive grants of stock appreciation rights, and as to each stock appreciation
right shall specify the number of shares, the stock appreciation right price, the term, the time or times at which the stock appreciation right may be exercised and all other terms and conditions of the stock appreciation right. The stock
appreciation right price shall not be less than 50% of the fair market value of the shares on the date of grant. 
 (c) Each stock appreciation right granted without a related option shall entitle the holder to receive from Mentor Graphics an amount equal to the excess of the fair market value at the time of exercise of one share of Mentor Graphics
common stock over the stock appreciation right price, multiplied by the number of shares covered by the stock appreciation right or portion thereof that is exercised. The shares subject to a stock appreciation right or portion thereof that is
exercised shall not be available for future option or stock appreciation right grants under the Plan. 
 8.3 (a) Payment
upon exercise of a general stock appreciation right by Mentor Graphics may be made in shares of Mentor Graphics common stock valued at fair market value, or in cash, or partly in shares and partly in cash. The Committee shall either specify the form
of payment or retain the power to disapprove any election by a holder to receive cash on exercise of a stock appreciation right. For the purpose of this paragraph, fair market value shall be determined according to subparagraph 5.1(c). 

 

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 (b) Payment upon exercise of a limited stock appreciation right by Mentor
Graphics may be made only in cash. 
 8.4 No fractional shares shall be issued upon exercise of a stock appreciation right. In
lieu thereof, cash may be paid in an amount equal to the value of the fraction or, in the discretion of the Committee, the number of shares may be rounded to the next whole share. 
 8.5 Stock appreciation rights will be subject to such rules, terms, and conditions, and shall be evidenced by an agreement in such form, as
the Committee may prescribe prior to the occurrence of a Change in Control. 
 8.6 Stock appreciation rights may not be assigned
or transferred except on death, by will or operation of law, or pursuant to a qualified domestic relations order as defined under the Code or Title I of the Employee Retirement Income Security Act. Stock appreciation rights may be exercised only by
the holder or by a successor or representative after death. 
 8.7 Unless otherwise determined by the Committee, no stock
appreciation right may be exercised by an officer of Mentor Graphics subject to Section 16 of the 1934 Act during the first six months following the date of grant. 
 9. Restricted Stock and Restricted Stock Units.  
 9.1 The Committee may
issue up to an aggregate of 5,000,000 shares (i) as restricted stock under this paragraph 9, (ii) pursuant to restricted stock units under this paragraph 9, and (iii) as Performance Shares (as defined in paragraph 10 below).
Restricted stock and restricted stock units may be issued under the Plan to any officer or key employee of Mentor Graphics or any subsidiary of Mentor Graphics for any consideration (including promissory notes and services) determined by the
Committee. Shares issued under the Plan shall be subject to the terms, conditions and restrictions determined by the Committee. The restrictions may include restrictions concerning transferability, repurchase by Mentor Graphics and forfeiture of the
shares issued, together with any other restrictions determined by the Committee. 
 9.2 All restricted stock and restricted
stock units issued pursuant to this paragraph 9 shall be subject to an award agreement, which shall be executed by Mentor Graphics and the recipient. The award agreement may contain any terms, conditions, restrictions, representations and warranties
required by the Committee. The certificates, if any, representing the shares shall bear any legends required by the Committee. 
 9.3 Mentor Graphics may require any recipient of restricted stock or restricted stock units to pay to Mentor Graphics in cash or by check upon demand amounts necessary to satisfy any applicable federal, state or local tax withholding
requirements. If the recipient fails to pay the amount demanded, Mentor Graphics or its subsidiary may withhold that amount from other amounts payable by Mentor Graphics or the subsidiary to the recipient, including salary, subject to applicable
law. With the consent of the Committee, a recipient may satisfy this obligation, in whole or in part, by instructing Mentor Graphics to withhold from any shares to be issued or by delivering to Mentor Graphics other shares of common stock; provided,
however, that the number of shares so withheld or delivered shall not exceed the minimum amount necessary to satisfy the required withholding obligation. Upon the issuance of restricted stock or restricted stock units, the number of shares reserved
for issuance under the Plan shall be reduced by the number of shares covered by the award. 
 10. Performance-Based Awards.
 
 The Committee may grant awards intended to qualify as qualified performance-based compensation under Section 162(m)
of the Code and the regulations thereunder (Performance-based Awards) to any officer or key employee of Mentor Graphics or any subsidiary of Mentor Graphics. The Committee may issue up to an aggregate of 5,000,000 shares as (i) Performance
Shares under this paragraph 10, and (ii) restricted stock under paragraph 9. Performance-based Awards shall be denominated at the time of grant either in common stock (Stock Performance Awards) or in dollar amounts (Dollar Performance Awards).
Payment under a Stock Performance Award or a Dollar Performance Award shall be made, at the discretion of the Committee, in common stock (Performance Shares), or in cash or in any combination thereof. Performance-based Awards shall be subject to the
following terms and conditions: 
 10.1 Award Period. The Committee shall determine the period of time for which a
Performance-based Award is made (Award Period). 
  

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 10.2 Performance Goals and Payment. The Committee shall establish in writing
objectives (Performance Goals) that must be met by Mentor Graphics, or any subsidiary, division or other unit of Mentor Graphics (Business Unit) during the Award Period as a condition to payment being made under the Performance-based Award. The
Performance Goals for each award shall be one or more targeted levels of performance with respect to one or more of the following objective measures with respect to Mentor Graphics or any Business Unit: earnings, earnings per share, stock price
increase, total shareholder return (stock price increase plus dividends), return on equity, return on assets, return on capital, economic value added, revenues, bookings, operating income, operating expenses, cash flows, increases in market share or
any of the foregoing before the effect of acquisitions, divestitures, accounting changes, and restructuring and special charges (determined according to criteria established by the Committee). The Committee shall also establish the number of
Performance Shares or the amount of cash payment to be made under a Performance-based Award if the Performance Goals are met or exceeded, including the fixing of a maximum payment (subject to paragraph 10.4). The Committee may establish other
restrictions to payment under a Performance-based Award, such as a continued employment requirement, in addition to satisfaction of the Performance Goals. Some or all of the Performance Shares may be delivered to the recipient at the time of the
award as restricted stock subject to forfeiture in whole or in part if Performance Goals or, if applicable, other restrictions are not satisfied. 
 10.3 Computation of Payment. During or after an Award Period, the performance of the Company or Business Unit, as applicable, during the period shall be measured against the Performance Goals. If
the Performance Goals are not met, no payment shall be made under a Performance-based Award. If the Performance Goals are met or exceeded, the Committee shall certify that fact in writing and certify the number of Performance Shares earned or the
amount of cash payment to be made under the terms of the Performance-based Award. 
 10.4 Maximum Awards. No participant
may receive in any fiscal year Stock Performance Awards under which the aggregate amount payable under the Awards exceeds the equivalent of 50,000 shares of common stock or Dollar Performance Awards under which the aggregate amount payable under the
Awards exceeds $1,000,000. 
 10.5 Tax Withholding. Each recipient who has received Performance Shares shall, upon
notification of the amount due, pay to Mentor Graphics in cash or by check amounts necessary to satisfy any applicable federal, state and local tax withholding requirements. If the recipient fails to pay the amount demanded, Mentor Graphics or its
subsidiary may withhold that amount from other amounts payable to the recipient, including salary, subject to applicable law. With the consent of the Committee, a recipient may satisfy this obligation, in whole or in part, by instructing Mentor
Graphics to withhold from any shares to be received or by delivering to Mentor Graphics other shares of common stock; provided, however, that the number of shares so delivered or withheld shall not exceed the minimum amount necessary to satisfy the
required withholding obligation. 
 10.6 Effect on Shares Available. The payment of a Performance-based Award in cash
shall not reduce the number of shares of common stock reserved for award under the Plan. The number of shares of common stock reserved for award under the Plan shall be reduced by the number of shares delivered to the recipient upon payment of an
award. 
 11. Changes in Capital Structure.  
 If any change is made in the outstanding common stock without Mentor Graphics’ receiving any consideration, such as a stock split,
reverse stock split, stock dividend, or combination or reclassification of the common stock, a corresponding change shall be made in the number of shares remaining available for awards under the Plan and in all other share amounts set forth in the
Plan, disregarding fractional shares, without any further approval of the shareholders. The adjustment shall be made by the Committee whose determination shall be conclusive. 
 12. Amendment or Termination of the Plan.  
 12.1 The Board of Directors may amend or terminate this Plan at any time subject to paragraph 12.2. 
 12.2 Unless the amendment is approved by the shareholders, no amendment shall be made in the Plan that would: 
 (a) Increase the total number of shares available for awards under the Plan or the total number of shares permitted to be issued under restricted stock awards, restricted stock units or Performance-based
Awards; 
  

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 (b) Increase the maximum option term; or 
 (c) Modify the requirements for eligibility under the Plan. 
 13. One-Time-Only Option Exchange Offer.  
 Notwithstanding any other provision of the Plan to the contrary, upon approval of the shareholders, the Committee may provide for, and Mentor Graphics may implement, a one-time-only option exchange offer,
pursuant to which certain outstanding options could, at the election of optionee, be tendered to Mentor Graphics for cancellation in exchange for the issuance of restricted stock units, provided that such one-time-only option exchange offer is
commenced within six months of the date of such shareholder approval. 
  

 7First Lien Agency Assignment and Amendment Agreement

 Exhibit 10.23 
 EXECUTION VERSION 
 FIRST LIEN AGENCY ASSIGNMENT AND
AMENDMENT AGREEMENT 
 This AGENCY ASSIGNMENT AGREEMENT, dated as of July 24, 2009 (this “Agreement”),
by and among, MORGAN STANLEY SENIOR FUNDING, INC. (“MSSF”), MORGAN STANLEY & CO. INCORPORATED (“MS&Co”), and MORGAN STANLEY SENIOR FUNDING (NOVA SCOTIA) CO. (“MSNS”, and together with
MSSF and MS&Co, the “Morgan Stanley Entities”) the LENDERS party hereto (the “Required Lenders”) and WILMINGTON TRUST FSB (“Wilmington Trust”), and is acknowledged and agreed to by Mitel
Networks, Inc., Mitel US Holdings, Inc., Mitel (Delaware), Inc. formerly known as Inter-Tel (Delaware) Incorporated and successor in interest to Arsenal Acquisition Corporation, and Mitel Networks Corporation (collectively, the
“Borrowers”). Reference is made to that certain First Lien Credit Agreement dated as of August 16, 2007, by and among the Borrowers, MSSF, as U.S. Administrative Agent thereunder (in such capacity, the “U.S.
Administrative Agent”), MSNS, as the Canadian Administrative Agent thereunder (in such capacity, the “Canadian Administrative Agent”), MS&Co, as Collateral Agent thereunder (in such capacity, the “Collateral
Agent” and together with U.S. Administrative Agent and the Canadian Administrative Agent, the “Agents”), and the Lenders party thereto from time to time (as amended, restated or otherwise modified from time to time, the
“Credit Agreement”). 
 W I T N E S S E T
H 
 WHEREAS, (a) Each of the Morgan Stanley Entities desires to resign from their respective capacities as Agents
under the Credit Agreement, the Security Agreement and each of the other Loan Documents (collectively, including each of the foregoing and the Loan Documents set forth on Schedule 1, the “Assigned Agreements”),
(b) Wilmington Trust desires to succeed the Morgan Stanley Entities as Agents under the Credit Agreement and each of the other Assigned Agreements and (c) each of the Morgan Stanley Entities desires to assign all of its rights (other than
the Retained Rights, as defined below), responsibilities, duties and obligations to Wilmington Trust, in each case as further set forth herein; 
 WHEREAS, the Lenders party hereto, among others, have entered into the Credit Agreement and, collectively, constitute “Required Lenders” thereunder; 
 WHEREAS, the Required Lenders (a) desire to acknowledge the resignation of each of the Morgan Stanley Entities from their respective
capacities as Agents under the Credit Agreement and each of the other Assigned Agreements, (b) desire to appoint Wilmington Trust as Agents under the Credit Agreement and each of the other Assigned Agreements and (c) desire to acknowledge
the assignment by the Morgan Stanley Entities of all of their respective rights (other than the Retained Rights, as defined below), responsibilities, duties and obligations to Wilmington Trust, in each case as further set forth herein; and

 WHEREAS, the Borrowers (a) desire to acknowledge the resignation of each of the Morgan Stanley Entities from their
respective capacities as Agents under the Credit Agreement and each of the other Assigned Agreements, (b) desire to acknowledge, accept and approve of Wilmington Trust’s appointment as Agents under the Credit Agreement and each of the
other Assigned Agreements and (c) desire to acknowledge the assignment by the Morgan Stanley

  

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Entities of all of their respective rights, responsibilities, duties and obligations to Wilmington Trust, in each case as further set forth herein. 
 NOW THEREFORE, in consideration of the premises contained herein, the parties hereto agree as follows: 
 1. Defined Terms. Unless otherwise defined herein, capitalized terms which are defined in the Credit Agreement are used herein as
defined therein. 
 2. Effectiveness of Resignation of the Agents. Each of the Morgan Stanley Entities hereby resigns
from their respective capacities as U.S. Administrative Agent, Canadian Administrative Agent and Collateral Agent under the Credit Agreement and each of the other Assigned Agreements, effective as of the date hereof, and the parties hereto
acknowledge, accept and approve such resignation; provided, however, any term or provision hereof to the contrary notwithstanding, the parties hereto acknowledge and agree that Article IX and Sections 11.3 and 11.4 of the Credit
Agreement and any other provisions of the Credit Agreement or any other Loan Document regarding payment of costs and expenses and indemnification of the Agents, together with any provision of any Loan Document that shall accrue to the benefit of any
retiring or resigning Agent, shall continue in effect for the benefit of the Morgan Stanley Entities in respect of any actions taken or omitted to be taken by them in their respective capacities as Agents under the Credit Agreement or any other Loan
Document on or prior to the date hereof (collectively, the “Retained Rights”). 
 3. Appointment of
Successor Agents; Assignment of Agency Rights. 
 (a) Pursuant to Section 9.4 of the Credit Agreement, the Required
Lenders hereby (a) appoint Wilmington Trust as the successor U.S. Administrative Agent (in such capacity, “Successor U.S. Administrative Agent”), as the successor Canadian Administrative Agent (in such capacity,
“Successor Canadian Administrative Agent”) and as the successor Collateral Agent (in such capacity, “Successor Collateral Agent”, and collectively with the Successor U.S. Administrative Agent and the Successor
Canadian Administrative Agent, the “Successor Agent”), in each case under and pursuant to the terms of the Credit Agreement; (b) notify the Borrowers of the foregoing appointments, and (c) authorize each of the Morgan
Stanley Entities and Wilmington Trust to enter into such customary assignment documentation as is reasonably acceptable to Wilmington Trust, in order to give effect to such appointment and to assign such roles (together with the rights, duties,
obligations, Liens and Agency Rights (as defined below) associated therewith) from the Morgan Stanley Entities to Wilmington Trust. 
 (b) Pursuant to Section 9.4 of the Credit Agreement, effective as of the date set forth above: (i) Wilmington Trust, in its capacity as the Successor U.S. Administrative Agent, the Successor Canadian Agent and the Successor
Collateral Agent, by its signature below, hereby accepts its appointment as U.S. Administrative Agent, Canadian Administrative Agent and Collateral Agent and agrees to perform all of the duties of the U.S. Administrative Agent, Canadian
Administrative Agent and the Collateral Agent under, and pursuant to the terms and conditions of, the Credit Agreement and the other Loan Documents. 
 (c) Notwithstanding the method of appointment of successor U.S. Administrative Agent, successor Canadian Administrative Agent and successor Collateral Agent that is set forth

  

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in Section 9.4 of the Credit Agreement or any other provision of any of the Assigned Agreements, all parties hereto acknowledge that pursuant to Section 3(a) and
Section 3(b) above, the Required Lenders have appointed Wilmington Trust as the successor U.S. Administrative Agent, successor Canadian Administrative Agent and as the successor Collateral Agent under the Credit Agreement and each of the
Assigned Agreements, effective immediately upon the resignation of the Morgan Stanley Entities in their respective capacities as Agents. The parties hereto waive the provision of Section 9.4(b) of the Credit Agreement to the extent it requires
the Successor Canadian Administrative Agent to be a Canadian Facility Lender or to be a commercial banking institution organized under the laws of Canada (or any Province thereof) and having a combined capital and surplus of at least C$250,000,000.

 (d) By virtue of the resignation of the Morgan Stanley Entities as Agents and the appointment of the
Successor Agent, all parties hereto acknowledge that Wilmington Trust has succeeded (by way of assignment) to all of the rights (other than the Retained Rights) and interests of the U.S. Administrative Agent, the Canadian Administrative Agent and
the Collateral Agent under all of the Loan Documents (collectively, the “Agency Rights”), including with respect to all of the Collateral Agent’s rights and interests as the secured party, on behalf of the Secured Parties, with
respect to the collateral pledged to it pursuant to Section 2 of the Security Agreement and any other provision of any other Loan Document and as the holder of any Lien therein. Without limiting the foregoing, effective as of the date hereof,
MSSF, MSNS and MS&Co, in their respective capacities as U.S. Administrative Agent, Canadian Administrative Agent and Collateral Agent, each hereby absolutely and unconditionally grant, assign, transfer, convey and deliver (collectively,
“Assign” and any act of Assigning, an “Assignment”) to Wilmington Trust all of their rights (other than the Retained Rights), title, interest, duties and obligations in all of the Agency Rights (all of the foregoing
Assignments of Agency Rights, the “Agency Assignment”). Each of the Borrowers hereby consents to such Agency Assignment. The Successor Agent hereby absolutely and unconditionally accepts the foregoing Assignment, assumes all of such
rights, duties and obligations Assigned to them as stated above pursuant to this Agreement and agrees to perform and to be bound by all of the terms, covenants and conditions of such rights, title, interest, duties and obligations which arise from
and after the date hereof. Notwithstanding anything herein to the contrary, all of such assigned Liens shall in all respects be continuing and in effect and are hereby reaffirmed. Without limiting the generality of the foregoing, any reference to
any of the Morgan Stanley Entities on any publicly filed document, to the extent such filing relates to the Liens in the Collateral assigned hereby and until such filing is modified to reflect the interests of Wilmington Trust, shall, with respect
to such Liens, constitute a reference to such Morgan Stanley Entity as collateral representative of Wilmington Trust (provided, that the parties hereto agree that the Morgan Stanley Entities’ role as such collateral representative shall impose
no duties, obligations or liabilities on any Morgan Stanley Entity). In furtherance of the foregoing, Wilmington Trust hereby appoints MS&Co as sub-Collateral Agent for the perfection of any Liens in such Collateral and MS&Co will take
instructions from Wilmington Trust with respect to such Collateral, until such filing is modified; provided that, unless MS&Co expressly agrees in writing, such appointment shall automatically lapse on the 60th day following the date hereof. 
 (e) Each of the Morgan Stanley Entities agrees to promptly deliver any material notices, statements, reports or other information received
by it under the Loan Documents to the Successor Agent. The Morgan Stanley Entities, the Successor Agent and the Borrowers each

  

 3 

 
agree to execute, deliver, and/or cause to be delivered any and all instruments, agreements and other documents, including acknowledgments or assignments, reasonably requested by the Successor
Agent to evidence or otherwise memorialize the Agency Assignment and the succession of the Successor Agent to the Agency Rights. The Morgan Stanley Entities and the Borrowers each agree to take all actions reasonably requested by the Successor Agent
to transfer and facilitate the transfer of information relating to the Loan Documents to the Successor Agent. In connection with the foregoing, MS&Co hereby agrees to take all steps reasonably requested by Successor Collateral Agent to ensure
that Successor Collateral Agent becomes the successor secured party with respect to all Liens granted by the Borrowers currently existing in favour of Collateral Agent, without any interruption in the perfection or priority currently enjoyed by
Collateral Agent. Each of the Morgan Stanley Entities and each of the Borrowers authorizes Wilmington Trust and their counsel to (a) file any Uniform Commercial Code assignments or amendments with respect to the Uniform Commercial Code
financing statements listed on Schedule 2A hereto, and (b) file any assignments or amendments with respect to any Personal Property Security Act financing statements listed on Schedule 2B hereto, in each case as Wilmington Trust
deems necessary to evidence Wilmington Trust’s succession as Agents under the Credit Agreement and the other Loan Documents. The Borrowers each agree to pay on demand all reasonable expenses of the Morgan Stanley Entities (including the
reasonable fees and out-of-pocket expenses of legal counsel) in connection with the Morgan Stanley Entities’ performance of, and compliance with, this Section 3(e). 
 (f) The parties hereto agree that Wilmington Trust shall not bear any responsibility for any actions taken or omitted to be taken by any
Morgan Stanley Entity while any such Morgan Stanley Entity served as an Agent under the Credit Agreement and the other Loan Documents or for any other event or action related to the Credit Agreement which occurred prior to the effectiveness of this
Agreement. The parties hereto agree that none of the Morgan Stanley Entities shall bear any responsibility for any actions taken or omitted to be taken by any Wilmington Entity as an Agent under the Credit Agreement and the other Loan Documents nor
shall any Morgan Stanley Entity bear responsibility for any action taken hereunder at the request or direction of the Successor Agent. 
 (g) Wilmington Trust hereby agrees that any notice or other communication required or permitted to be given to it pursuant to any Loan Document may be sent to it at the following address: 
 Wilmington Trust FSB 
 1100 North Market Street 
 Rodney Square North 
 Wilmington, DE 19890 
 Attn: Jim Hanley, Vice President 
 Fax: (302) 636-4149 
 E-mail: jhanley@wilmingtontrust.com 
  

 4 

 4. Acknowledgements of Morgan Stanley. 
 (a) Subject to Section 9 below, upon the effectiveness of this Agreement and payment in full of all fees and expenses set forth
on Schedule 3 hereto, each of the Morgan Stanley Entities acknowledges and agrees that none of the Obligors have any further obligations to any of the Morgan Stanley Entities in their respective capacities as Agents under the Credit Agreement
or any Loan Document, other than in respect of the Retained Rights. 
 (b) Each of the Morgan Stanley Entities, solely in their
capacities as Agents, agrees that, with respect to any items of payment, proceeds of collateral or other collections it may receive from and after the date hereof in connection with its capacity as an Agent under the Loan Documents other than any
amounts due it hereunder and other than any amounts due to it in its capacity as a Lender (collectively, the “Collections”), such Morgan Stanley Entity disclaims any interest in such Collections and agrees to promptly notify the
Successor Agent or the Borrowers, as applicable, of its receipt thereof and to promptly deliver to the Successor Agent or the Borrowers, as applicable, in the same form as received, any such Collections to such account as the Successor Agent shall
specify at such time. 
 5. Register. From and after the date of this Agreement, the Successor Agent (or its agent or
sub-agent appointed by it) shall maintain at the Successor Agent’s Office the U.S. Register and the Canadian Register. Within 5 Business Days after the date of this Agreement, MSSF and MSNS shall cause the U.S. Register and the Canadian
Register, respectively, to be delivered to the Successor Agent. From and after the date of this Agreement, each of the Borrowers hereby designates the Successor Agent to serve as the Borrowers’ agent solely for purposes of maintaining the
Registers as provided in Section 2.7 of the Credit Agreement. 
 6. Effectiveness. This Agreement shall become
effective on and as of the date that the U.S. Administrative Agent and the Canadian Administrative Agent shall have received counterparts of this Agreement duly executed and delivered by a duly authorized officer of each of the Required Lenders,
each of the Borrowers, the Collateral Agent and the Successor Agent, together with the payment of fees and expenses listed on Schedule 3. Each party hereto hereby waives any notice required under Section 9.4 of the Credit Agreement with respect
to the resignation of the Morgan Stanley Entities as Agents as contemplated hereby. This Agreement shall not, except as expressly provided herein, operate as an amendment or waiver of any right, power or remedy of any Lender or the Successor Agent
under any of the Loan Documents, nor constitute an amendment or waiver of any provision of any of the Loan Documents. Except as expressly provided herein, all of the provisions and covenants of the Credit Agreement and the other Loan Documents are
and shall continue to remain in full force and effect in accordance with the terms thereof and are hereby in all respects ratified and confirmed. Each party hereto acknowledges that Wilmington Trust is neither a U.S. Facility Lender nor a Canadian
Facility Lender and hereby waives the provisions of Section 9.4 of the Credit Agreement to the extent any such provisions would restrict the appointment of any of Wilmington Trust as an Agent. 
  

 5 

 7. Fees and Expenses. 
 (a) To the extent invoiced on or prior to the date hereof, each of the Borrowers agrees to pay to the Morgan Stanley Entities, on the date
hereof all reasonable due and outstanding fees, costs and other expenses incurred by any such Morgan Stanley Entity in connection with performing their respective roles as Agent under the Loan Documents as set forth on Schedule 3 hereto,
including the reasonable costs and fees of legal counsel provided by Allen & Overy LLP and Faskin Martineau Dumoulin LLP. 
 (b) Without limiting the Borrowers’ obligations under the Loan Documents (including all obligations by Mitel Networks Corporation under Article X of the Credit Agreement), the Borrower shall be liable for all reasonable, documented,
out-of-pocket costs and expenses incurred by any of the Morgan Stanley Entities and the Successor Agent in connection with this Agreement or in connection with any of the actions taken by either of them contemplated hereunder and shall promptly
reimburse such Morgan Stanley Entity or the Successor Agent upon demand therefor. 
 (c) Subject to Section (e) below, each
of the parties hereto hereby agrees that neither any of the Morgan Stanley Entities nor any of its Affiliates shall be under any obligation to share, rebate, disgorge or refund any fees or expense reimbursement it has received or is entitled to
receive under the Loan Documents (including under this Agreement). 
 (d) The fees payable by the Borrowers to the Successor
Agent shall be as separately agreed between the Borrowers and the Successor Agent. The Borrowers shall pay, without deduction or withholding for Taxes imposed by any Governmental Authority, all fees and other amounts payable to Wilmington Trust
under the Fee Letter and the other Loan Documents. 
 (e) Wilmington Trust hereby covenants that, while no Event of Default has
occurred and is continuing, Wilmington Trust will perform all of its services under this Agreement and the other Loan Documents from its offices or other premises in the United States and will not render any of its services in Canada. While any
Obligations remain outstanding and no Event of Default has occurred and is continuing, Wilmington Trust hereby indemnifies, exonerates and holds each Borrower free and harmless from and against any and all Canadian withholding Taxes (including
interest and penalties) payable with respect to the fees payable by the Borrowers to Wilmington Trust and incurred as a result of, arising out of, or relating to any breach of the foregoing covenant (“Indemnified Taxes”);
provided, however, that the Borrowers shall provide notice to Wilmington Trust of any assertion of any such withholding liability within 10 days of learning of such withholding liability and shall, at Wilmington Trust’s request
and expense, contest such withholding liability. Notwithstanding anything to the contrary in any of the Assigned Agreements, the Borrowers shall not be obligated to “gross-up” or otherwise pay any additional amounts pursuant to
Section 4.6 of the Credit Agreement to compensate Wilmington Trust for any Indemnified Taxes. 
 (f) MS&Co agrees to
pay Mitel Networks Corporation the amount of $12,500 upon execution of this Agreement which amount represents a reimbursement of administrative agent fees from the date hereof until August 16, 2009. 
  

 6 

 8. Representations and Warranties. 
 (a) The Successor Agent hereby represents and warrants that it is legally authorized to enter into and has duly executed and delivered this
Agreement. Wilmington Trust hereby represents that it is either (a) a commercial banking institution organized under the laws of the United States (or any State thereof) or (b) a United States branch or agency of a commercial banking
institution, in either case having a combined capital and surplus of at least US$ 250,000,000. 
 (b) Each of the undersigned
Lenders hereby represents and warrants severally, and not jointly or jointly and severally, that as of the date of execution of this Agreement, it owns Loans in the principal amount set forth below its signature block. 
 (c) Each of the parties hereto hereby represents and warrants that (i) it is legally authorized to enter into this Agreement and
perform its obligations hereunder, (ii) it has duly executed and delivered this Agreement, and (iii) this Agreement is a legal, valid and binding agreement of it, enforceable against it according to its terms, subject to applicable
bankruptcy, insolvency, reorganization, moratorium or other laws affecting creditors’ rights generally and subject to general principles of equity, regardless of whether considered in a proceeding in equity or at law. 
 (d) Except as specified in clauses (a), (b), (c), and (d) of this paragraph 8, this Agreement is hereby made without representation or
warranty of any kind, nature or description, and the Successor Agent acknowledges that none of the Morgan Stanley Entities have made any other representation or warranty as to the financial condition of the Borrowers or account debtors, values,
quality, quantities or locations of inventory or other assets or the collectability or realizability of any Collateral or any Obligations or as to the legality, validity, enforceability, perfection or priority of any Liens, Obligations or
Collateral. The Successor Agent acknowledges that it has made, to the extent determined by it to be necessary or prudent, its own independent investigation and determination of the foregoing matters and all other matters pertaining to the assignment
made hereby. 
 9. Indemnification, etc. Notwithstanding anything in this Agreement or in the Loan Documents to the
contrary, all parties hereto expressly acknowledge and agree that the provisions of Article IX and Sections 11.3 and 11.4 of the Credit Agreement, as existing before the date hereof, shall continue in effect for the benefit of the Morgan Stanley
Entities, its sub-agents and their respective officers, directors, employees and agents in connection with or as a result of the execution or delivery of this Agreement, any other Loan Document, or any amendment, amendment and restatement,
modification or waiver of the provisions hereof or thereof, or any agreement or instrument contemplated hereby or thereby, the performance by the parties hereto of their respective obligations hereunder or thereunder (including without limitation
for any actions taken or omitted to be taken by any of them in connection with any of the foregoing while any Morgan Stanley Entity was acting as an Agent and while any Morgan Stanley Entity was acting as bailee or sub-agent pursuant to
Section 3(d) hereof) or the consummation of the transactions contemplated hereby or thereby. 
 10. Release.
Each of the Borrowers and the Lenders, for themselves and each of their respective heirs, executors, administrators, successors, legal representatives and assigns and all

  

 7 

 
persons claiming by, through or under them, and each of their respective parent, subsidiary and/or affiliated companies and the shareholders, officers, directors, managers, trustees, partners
(limited, general or otherwise), members, employees, agents, consultants, predecessors, licensees, representatives and attorneys of all of the foregoing and their respective heirs, executors, administrators, successors, legal representatives and
assigns and all persons claiming by, through or under them or any of them (all hereinafter collectively referred to as the “Releasing Parties”), do hereby remise, release, acquit and forever discharge each of the Morgan Stanley
Entities and each of their respective past, present and future officers, directors, members, shareholders, beneficial owners, partners, employees, attorneys, agents, representatives, consultants, affiliates, parents, subsidiaries, agents,
predecessors, licensees, trustees, heirs, successors and assigns, and all persons or entities in privity with them or any of them, whether named herein or not (collectively, the “Resigning Agent Parties”) of, from and against any
and all rights, demands, obligations, actions, causes of action, suits, debts, dues, sums of money, compensation, accounts, rentals, commissions, reckonings, bonds, bills, specialties, covenants, contracts, controversies, agreements, promises, costs
(including attorneys fees and disbursements), damages, judgments, executions, claims and demands whatsoever, whether known or unknown, in contract or in tort, foreseen or unforeseen (regardless of by whom raised) at law or in equity, which the
Releasing Parties, and/or any of them, and/or any person claiming by, through or under any of the Releasing Parties and/or any other person now have, ever had, may ever have or may claim to have from the beginning of time through and including the
date hereof against the Resigning Agent Parties or any of them, singly or in any combination, on account of, arising out of, or in connection with any thing, cause, matter, transaction, act or omission of any nature whatsoever (except to the extent
such thing, cause, matter, transaction, act or omission constitutes the fraud, gross negligence or wilful misconduct of any such Resigning Agent Parties) of, or involving any or all of the following (collectively, the “Claims”):
(a) the Credit Agreement or any of the other Loan Documents, the Loans, the Obligations, this Agreement and any other document entered into in connection with the Obligations or any of the foregoing documents (collectively, the
“Operative Documents”), (b) any of the Releasing Parties in connection with the Obligations or any of the Operative Documents or (c) any transactions, occurrences, acts, omissions, statements, promises, agreements or
undertakings of any of the Resigning Agent Parties made or omitted to be made in connection with any of the foregoing or other matters arising out of any duties, responsibilities, or obligations under or relating to the Obligations or any of the
Operative Documents. The parties hereto agree and acknowledge that notwithstanding anything to the contrary in this Agreement, the foregoing release shall not apply to any Claim arising after the effectiveness of this Agreement with respect to the
obligations retained or to be performed by any of the Morgan Stanley Entities under this Agreement. Nothing in this paragraph shall be deemed to affect the indemnification of any Morgan Stanley Entity as provided for in Section 9 hereof
or pursuant to the Loan Documents. 
 11. Amendments Loan Documents. The Borrowers and the undersigned Lenders hereby
agree and acknowledge that, from and after the date hereof, under the Credit Agreement and the other Assigned Agreements: (i) the Successor U.S. Administrative Agent shall be, and shall be deemed to be, the U.S. Administrative Agent;
(ii) the Successor Canadian Administrative Agent shall be, and shall be deemed to be, the Canadian Administrative Agent and (iii) the Successor Collateral Agent shall be, and shall be deemed to be, the Collateral Agent. In furtherance of
the foregoing, as of the date hereof, all provisions referencing MSSF or MS&Co as the U.S. Administrative Agent or the Collateral Agent in the Credit Agreement and

  

 8 

 
the other Loan Documents are hereby amended to reference Wilmington Trust, as the U.S. Administrative Agent or the Collateral Agent, as applicable, and all provisions referencing MSNS as the
Canadian Administrative Agent in the Credit Agreement and the other Loan Documents are hereby amended to reference Wilmington Trust, as the Canadian Administrative Agent. The Credit Agreement is also hereby amended by revising the definition of
“Fee Letter” to mean the letter dated as of the date of this Agreement, regarding the administration fees for first lien credit facility, among the Borrowers and Wilmington Trust. 
 12. Agreement as Loan Document; Reaffirmation of Loan Documents and Assigned Agreements. This Agreement is a Loan Document. Each of
the Borrowers hereby expressly acknowledges and confirms, both before and after giving effect to this Agreement, that it is bound by each of the Loan Documents and Assigned Agreements to which it is a party by virtue of its having been an original
signatory thereto. Each of the Loan Documents and Assigned Agreements are and shall continue to be in full force and effect and are hereby in all respects ratified and confirmed. 
 13. Further Assurances. At the sole cost and expense of the Borrowers, the Borrowers, the Morgan Stanley Entities and Wilmington
Trust, from time to time, will promptly execute and deliver all further instruments and documents, and take all further action, that may be reasonably required or that the Successor Collateral Agent may reasonably request to fully perform and carry
out the provisions hereof or to continue perfection of the Liens or to preserve and protect any security interest assigned (or purported to be assigned) hereby, including execution and delivery of amendments and assignments of deposit account
control agreements, mortgages, deeds of trust, insurance policies and governmental filings. 
 14. Counterparts. This
Agreement may be executed by one or more of the parties to this Agreement on any number of separate counterparts (including by telecopy or pdf), and all of said counterparts taken together shall be deemed to constitute one and the same instrument.

 15. GOVERNING LAW. 
 (a) THIS AGREEMENT AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES UNDER THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK,
WITHOUT REGARD TO CONFLICTS OF LAW PRINCIPLES THAT WOULD REQUIRE THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION. 
 (b)
Each party hereto hereby irrevocably and unconditionally submits, for itself and its property, to the nonexclusive jurisdiction of the Supreme Court of the State of New York sitting in New York County and of the United States District Court of the
Southern District of New York, and any appellate court from any thereof, in any action or proceeding arising out of or relating to this Agreement, or for recognition or enforcement of any judgment, and each of the parties hereto hereby irrevocably
and unconditionally agrees that all claims in respect of any such action or proceeding may be heard and determined in such New York State court or, to the fullest extent permitted by applicable law, in such Federal court. Each of the parties hereto
agrees that a final judgment in any such action or proceeding shall be conclusive and may be enforced in other jurisdictions by suit on the judgment or in any other manner provided by law.

  

 9 

 
Nothing in this Agreement or any other Loan Document shall affect any right that the Agents or the Successor Agent or any Lender may otherwise have to bring any action or proceeding relating to
this Agreement or any other Loan Document against any Borrower or its properties in the courts of any jurisdiction. 
 (c) Each
party hereto hereby irrevocably and unconditionally waives, to the fullest extent permitted by applicable law, any objection which it may now or hereafter have to the laying of venue of any suit, action or proceeding arising out of or relating to
this Agreement or any other Loan Document in any court referred to in Section 14(b) hereof. Each of the parties hereto hereby irrevocably waives, to the fullest extent permitted by applicable Requirements of Law, the defence of an
inconvenient forum to the maintenance of such action or proceeding in any such court. 
 (d) Each party hereto irrevocably
consents to service of process in any action or proceeding arising out of or relating to any Loan Document, in the manner provided for notices (other than telecopier) in Section 11.2 of the Credit Agreement. Nothing in this Agreement or any
other Loan Document will affect the right of any party hereto to serve process in any other manner permitted by applicable Requirements of Law. 
 16. WAIVERS OF JURY TRIAL. THE BORROWERS, THE AGENTS, THE REQUIRED LENDERS AND THE SUCCESSOR AGENT HEREBY IRREVOCABLY AND UNCONDITIONALLY WAIVE TRIAL BY JURY IN ANY LEGAL ACTION OR
PROCEEDING RELATING TO THIS AGREEMENT AND FOR ANY COUNTERCLAIM THEREIN. 
  

 10 

 IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed and
delivered by their respective duly authorized officers as of the date first above written. 
  

			
	 MORGAN STANLEY SENIOR FUNDING, INC.
 as the outgoing U.S. Administrative Agent

		
	By:	 	 “Stephen B. King”

	Name:	 	Stephen B. King
	Title:	 	Duly Authorized Signatory
	
	 MORGAN STANLEY SENIOR FUNDING,
 (NOVA SCOTIA) CO.
 as the outgoing Canadian Administrative Agent

		
	By:	 	 “Ian Sandler”

	Name:	 	Ian Sandler
	Title:	 	Duly Authorized Signatory
	
	 MORGAN STANLEY & CO. INCORPORATED
 as the outgoing Collateral Agent

		
	By:	 	 “Stephen B. King”

	Name:	 	Stephen B. King
	Title:	 	Duly Authorized Signatory

							
	 SPECIAL VALUE CONTINUATION PARTNERS, LP,
 as a Lender
	 		 	 Principal Amount of Loans:
 $19,839,674.14

				
	By:	 	TENNENBAUM CAPITAL PARTNERS, LLC	 		 	
	Its:	 	Investment Manager	 		 	
				
	By:	 	 “Rajneesh Vig”
	 		 	
	Name:	 	Rajneesh Vig	 		 	
	Title:	 	Partner	 		 	
			
	 SPECIAL VALUE OPPORTUNITIES FUND, LLC,
 as a Lender
	 		 	 Principal Amount of Loans:
 $34,042,932.31

				
	By:	 	TENNENBAUM CAPITAL PARTNERS, LLC	 		 	
	Its:	 	Investment Manager	 		 	
				
	By:	 	 “Rajneesh Vig”
	 		 	
	Name:	 	Rajneesh Vig	 		 	
	Title:	 	Partner	 		 	
			
	 SPECIAL VALUE EXPANSION FUND, LLC,
 as a Lender
	 		 	 Principal Amount of Loans:
 $14,364,106.46

				
	By:	 	TENNENBAUM CAPITAL PARTNERS, LLC	 		 	
	Its:	 	Investment Manager	 		 	
				
	By:	 	 “Rajneesh Vig”
	 		 	
	Name:	 	Rajneesh Vig	 		 	
	Title:	 	Partner	 		 	

 [Signature Page to Agency Assignment and Amendment Agreement] 

							
	 TENNENBAUM MULTI-STRATEGY MASTER FUND,
 as a Lender
	 		 	 Principal Amount of Loans:
 $48,461,802.01

				
	By:	 	TENNENBAUM CAPITAL PARTNERS, LLC	 		 	
	Its:	 	Investment Advisor	 		 	
				
	By:	 	 “Eric Pagel”
	 		 	
	Name:	 	Eric Pagel	 		 	
	Title:	 	Partner	 		 	

 [Signature Page to Second Lien Agency Assignment and Amendment Agreement] 

							
	 TENNENBAUM OPPORTUNITIES PARTNERS V, LP,
 as a Lender
	 		 	 Principal Amount of Loans:
 $52,907,792.12

				
	By:	 	TENNENBAUM CAPITAL PARTNERS, LLC	 		 	
	Its:	 	Investment Manager	 		 	
				
	By:	 	 “Rajneesh Vig”
	 		 	
	Name:	 	Rajneesh Vig	 		 	
	Title:	 	Partner	 		 	

 [Signature Page to Agency Assignment and Amendment Agreement] 

			
	 WILMINGTON TRUST FSB,
 as the Successor U.S. Administrative Agent, Successor Canadian Agent and as the Successor Collateral Agent

		
	By:	 	 “James A. Hanley”

	Name:	 	James A. Hanley
	Title:	 	Vice President

 [Signature Page to
Agency Assignment and Amendment Agreement] 

			
	ACKNOWLEDGED AND AGREED, as of the date first written above:
	
	THE “BORROWERS”
	
	MITEL NETWORKS CORPORATION
		
	By:	 	 “Gregory J. Hiscock”

	Name:	 	Gregory J. Hiscock
	Title:	 	General Counsel and Corporate Secretary
	
	MITEL NETWORKS, INC.
		
	By:	 	 “Gregory J. Hiscock”

	Name:	 	Gregory J. Hiscock
	Title:	 	Secretary
	
	MITEL (DELAWARE), INC.
		
	By:	 	 “Gregory J. Hiscock”

	Name:	 	Gregory J. Hiscock
	Title:	 	Secretary
	
	MITEL US HOLDINGS, INC.
		
	By:	 	 “Gregory J. Hiscock”

	Name:	 	Gregory J. Hiscock
	Title:	 	Secretary

 [Signature Page to Agency
Assignment and Amendment Agreement] 

 Schedule 1 
 LOAN DOCUMENTS 
  

	1.	First Lien Credit Agreement, dated August 16, 2007, by and among, Mitel Networks Corporation, Mitel Networks, Inc., Mitel US Holdings, Inc. and Mitel (Delaware),
Inc., (as successor interest to Arsenal Acquisition Corporation and formerly known as Inter-Tel (Delaware), Incorporated (“MDI”)), as the borrowers, various financial institutions and other persons from time to time parties hereto,
as the lenders, Morgan Stanley Senior Funding (Nova Scotia) Co, as the Canadian administrative agent, Morgan Stanley Senior Funding, Inc., as the U.S. administrative agent, Morgan Stanley & Co. Incorporated, as the collateral agent, and
Morgan Stanley Senior Funding, Inc. Morgan Stanley Senior Funding (Nova Scotia) Co. and Merrill Lynch, Pierce, Fenner & Smith Incorporated, as the co-syndication agents, as amended, restated or otherwise modified through the date hereof;

  

	2.	U.S. Pledge and Security Agreement, dated August 16, 2007 by and among Mitel Networks, Inc., Mitel US Holdings, Inc., and MDI, and each U.S. Subsidiary Guarantor
from time to time a party to this Security Agreement, in favor of Morgan Stanley & Co. Incorporated, as collateral agent for the secured parties; 

  

	3.	Subsidiary Guaranty, dated August 16, 2007, by each Subsidiary Guarantor party thereto from time to time, in favor of Morgan Stanley & Co. Incorporated,
as collateral agent for each of the secured parties; 

  

	4.	Copyright Security Agreement, dated August 16, 2007, by MDI, in favor of Morgan Stanley & Co. Incorporated, as collateral agent for each of the secured
parties; 

  

	5.	Copyright Security Agreement, dated August 16, 2007, by Inter-Tel Integrated Systems, Inc. (now Mitel Networks, Inc.), in favor of Morgan Stanley & Co.
Incorporated, as collateral agent for each of the secured parties; 

  

	6.	Patent Security Agreement, dated August 16, 2007, by MDI, in favor of Morgan Stanley & Co. Incorporated, as collateral agent for each of the secured
parties; 

  

	7.	Patent Security Agreement, dated August 16, 2007, by Inter-Tel Integrated Systems, Inc. (now Mitel Networks, Inc.), in favor of Morgan Stanley & Co.
Incorporated, as collateral agent for each of the secured parties; 

  

	8.	Patent Security Agreement, dated August 16, 2007, by Mitel Networks, Inc., in favor of Morgan Stanley & Co. Incorporated, as collateral agent for each of
the secured parties; 

  

	9.	Trademark Security Agreement, dated August 16, 2007, by MDI, in favor of Morgan Stanley & Co. Incorporated, as collateral agent for each of the secured
parties; 

  

	10.	Trademark Security Agreement, dated August 16, 2007, by Inter-Tel Integrated Systems, Inc. (now Mitel Networks, Inc.), in favor of Morgan Stanley & Co.
Incorporated, as collateral agent for each of the secured parties; 

  

	11.	 Intercreditor Agreement, dated August 16, 2007, by and among, Morgan Stanley & Co. Inc., as the first lien agent thereunder, Morgan
Stanley & Co. Inc., as second lien agent

	 	 
thereunder, Morgan Stanley & Co. Inc., as the control agent thereunder, Mitel Networks Corporation, Mitel Networks, Inc., Mitel US Holdings, Inc. and MDI, and the guarantors party
thereto from time to time; 

  

	12.	Canadian Pledge and Security Agreement, dated August 16, 2007 by and among Mitel Networks Corporation and each Canadian Subsidiary Guarantor from time to time a
party to this Security Agreement, in favor of Morgan Stanley & Co. Incorporated, as collateral agent for the secured parties; 

  

	13.	Debenture dated September 24, 2007 made between Inter-Tel Lake Limited, Lake Communications Limited and Morgan Stanley & Co. Incorporated, as security
trustee for the Secured Parties; 

  

	14.	Supplement dated September 24, 2007 to the Subsidiary Guaranty dated August 16, 2007 among the Subsidiary Guarantors from time to time party thereto, in favor
of Morgan Stanley & Co. Incorporated, as collateral agent for each of the Secured Parties; 

  

	15.	Control Agreement – Specific Collateral dated December 4, 2007 by and among Mitel Networks Corporation, as Pledgor, Tianchi Mitel Telecommunicatios Corp.,
Mitel Comercio e Servicos do Brasil Ltda, and Mitel Networks Overseas Limited, as Issuers, and Morgan Stanley & Co. Incorporated, as Collateral Agent; 

  

	16.	All Landlord Consents obtained by Morgan Stanley & Co. Incorporated, as Collateral Agent; 

  

	17.	Debenture dated August 16, 2007 by and between Mitel Networks Limited, as Chargor and Morgan Stanley & Co. Incorporated, as security trustee for the
Secured Parties; 

  

	18.	Assigned Account Agreement dated December 14, 2007 by and among Mitel Networks, Inc., Morgan Stanley & Co. Incorporated, and Harris N.A.;

  

	19.	Blocked Account Control Agreement dated December 14, 2007 by and among Inter-Tel (Delaware), Inc. (now Mitel (Delaware), Inc.), Morgan Stanley & Co.
Incorporated, and JPMorgan Chase Bank, N.A.; 

  

	20.	Blocked Account Control Agreement dated December 14, 2007 by and among Inter-Tel Leasing, Inc. (now Mitel Leasing, Inc.), Morgan Stanley & Co.
Incorporated, and JPMorgan Chase Bank, N.A.; 

  

	21.	Blocked Account Control Agreement dated December 14, 2007 by and among Mitel Networks, Inc., Morgan Stanley & Co. Incorporated, and JPMorgan Chase Bank,
N.A.; 

  

	22.	Four Party Wholesale Lockbox Agreement dated December 14, 2007 by and among Inter-Tel Technologies, Inc. (now Mitel Technologies, Inc.), Morgan Stanley &
Co. Incorporated, and Wells Fargo Bank, National Association; and 

  

	23.	Four Party Wholesale Lockbox Agreement dated December 14, 2007 by and among Inter-Tel Incorporated (now Mitel (Delaware), Inc.), Morgan Stanley & Co.
Incorporated, and Wells Fargo Bank, National Association. 

  

 2 

 Schedule 2A 
 UCC-1 FINANCING STATEMENTS 
  

											
	 Debtor
	 	 Secured Party
	 	 Jurisdiction
	 	 File Number
	 	 Scope of Lien
	 	 File Date

	Arsenal Acquisition Corporation	 	Morgan Stanley & Co. Incorporated, as Collateral Agent	 	DE SOS	 	2007 3138541	 	All of the Debtor’s personal property, whether now owned or hereafter acquired or coming into existence, and wherever located.	 	8/16/2007
						
	 Inter-Tel (Delaware), Incorporated – Tempe, AZ
  
 Amended to change name of Debtor: Mitel (Delaware), Inc.

	 	Morgan Stanley & Co. Incorporated, as Collateral Agent	 	DE SOS	 	 2007 3139416
 2008 2520110
	 	All of the Debtor’s personal property, whether now owned or hereafter acquired or coming into existence, and wherever located.	 	 8/16/2007
 7/22/2008

						
	 Inter-Tel (Delaware), Incorporated – Reno, NV
  
 Amended to change name of Debtor: Mitel (Delaware), Inc.

	 	Morgan Stanley & Co. Incorporated, as Collateral Agent	 	DE SOS	 	 2007 3139457
 2008 2520078
	 	All of the Debtor’s personal property, whether now owned or hereafter acquired or coming into existence, and wherever located.	 	 8/16/2007
 7/22/2008

						
	Mitel Networks Corporation	 	Morgan Stanley & Co. Incorporated, as Collateral Agent	 	D.C.Recorder of Deeds	 	2007108736	 	All of the Debtor’s personal property, whether now owned or hereafter acquired or coming into existence, and wherever located.	 	8/17/2007

											
	 Debtor
	 	 Secured Party
	 	 Jurisdiction
	 	 File Number
	 	 Scope of Lien
	 	 File Date

	Mitel Networks, Inc.	 	Morgan Stanley & Co. Incorporated, as Collateral Agent	 	DE SOS	 	2007 3139515	 	All of the Debtor’s personal property, whether now owned or hereafter acquired or coming into existence, and wherever located.	 	8/16/2007
						
	Mitel US Holdings, Inc.	 	Morgan Stanley &Co. Incorporated, as Collateral Agent	 	DE SOS	 	2007 3139549	 	All of the Debtor’s personal property, whether now owned or hereafter acquired or coming into existence, and wherever located.	 	8/16/2007
						
	Swan Solutions Limited	 	Morgan Stanley & Co. Incorporated, as Collateral Agent	 	D.C. Recorder of Deeds	 	2007108738	 	All of the Debtor’s personal property, whether now owned or hereafter acquired or coming into existence, and wherever located.	 	8/17/2007
						
	Mitel Networks Limited	 	Morgan Stanley & Co. Incorporated, as Collateral Agent	 	D.C. Recorder of Deeds	 	2007108737	 	All of the Debtor’s personal property, whether now owned or hereafter acquired or coming into existence, and wherever located.	 	8/17/2007
						
	 Inter-Tel Technologies, Inc. – Phoenix, AZ
  
 Amended to change name of Debtor: Mitel Technologies, Inc.
	 	Morgan Stanley & Co. Incorporated, as Collateral Agent	 	AZ SOS	 	200714903961	 	All of the Debtor’s personal property, whether now owned or hereafter acquired or coming into existence, and wherever located.	 	 8/17/2007
 7/25/2008

						
	 Inter-Tel Technologies, Inc. – Houston, TX
  
 Amended to change name of Debtor: Mitel Technologies, Inc.
	 	Morgan Stanley & Co. Incorporated, as Collateral Agent	 	AZ SOS	 	200714903949	 	All of the Debtor’s personal property, whether now owned or hereafter acquired or coming into existence, and wherever located.	 	 8/17/2007
 7/25/2008

											
	 Debtor
	 	 Secured Party
	 	 Jurisdiction
	 	 File Number
	 	 Scope of Lien
	 	 File Date

	Inter-Tel Integrated Systems, Inc.	 	Morgan Stanley & Co. Incorporated, as Collateral Agent	 	AZ SOS	 	200714903927	 	All of the Debtor’s personal property, whether now owned or hereafter acquired or coming into existence, and wherever located.	 	8/17/2007
						
	Inter-Tel Europe Limited	 	Morgan Stanley & Co. Incorporated, as Collateral Agent	 	D.C. Recorder of Deeds	 	2007108735	 	All of the Debtor’s personal property, whether now owned or hereafter acquired or coming into existence, and wherever located.	 	8/17/2007
						
	 Inter-Tel Leasing, Inc. – Houston, TX
  
 Amended to change name of Debtor: Mitel Leasing, Inc.
	 	Morgan Stanley & Co. Incorporated, as Collateral Agent	 	AZ SOS	 	200714903905	 	All of the Debtor’s personal property, whether now owned or hereafter acquired or coming into existence, and wherever located.	 	 8/17/2007
 7/25/2008

						
	Inter-Tel Leasing, Inc. – Tempe, AZ	 	Morgan Stanley & Co. Incorporated, as Collateral Agent	 	AZ SOS	 	200714903881	 	All of the Debtor’s personal property, whether now owned or hereafter acquired or coming into existence, and wherever located.	 	8/17/2007
						
	 Inter-Tel Netsolutions, Inc. – Phoenix, AZ
  
 Amended to change name of Debtor: Mitel Netsolutions, Inc.
	 	Morgan Stanley & Co. Incorporated, as Collateral Agent	 	TX SOS	 	 070028040586
 0800217619
	 	All of the Debtor’s personal property, whether now owned or hereafter acquired or coming into existence, and wherever located.	 	 8/16/2007
 6/26/2008

						
	 Inter-Tel Netsolutions, Inc. – Reno, NV
  
 Amended to change name of Debtor: Mitel Netsolutions, Inc.
	 	Morgan Stanley & Co. Incorporated, as Collateral Agent	 	TX SOS	 	 070028040697
 08002197623
	 	All of the Debtor’s personal property, whether now owned or hereafter acquired or coming into existence, and wherever located.	 	 8/16/2007
 6/26/2008

											
	 Debtor
	 	 Secured Party
	 	 Jurisdiction
	 	 File Number
	 	 Scope of Lien
	 	 File Date

	Mitel Networks Holdings Limited	 	Morgan Stanley & Co. Incorporated, as Collateral Agent	 	DC Recorder of Deeds	 	207108739	 	All of the Debtor’s personal property, whether now owned or hereafter acquired or coming into existence, and wherever located.	 	8/17/2007

 Schedule 2B 
 PPSA FINANCING STATEMENTS 
  

											
	 Debtor
	 	 Secured Party
	 	 Jurisdiction
	 	 Registration Number
	 	 Scope of Lien
	 	 File Date

	 Mitel Networks Corporation/ Corporation Mitel Networks
  
 Mitel Networks Corporation
  
 Corporation Mitel Networks
  
 Corporation Mitel Networks/Mitel
 Networks Corporation
	 	Morgan Stanley & Co. Incorporated	 	Ontario	 	 File No. 637868736
 2007080217591590 9186
	 	All present and after acquired personal property of the debtor and, without limitation, all fixtures, crops and licenses.	 	8/7/2007
						
	 Mitel Networks Corporation/ Corporation Mitel Networks
  
 Mitel Networks Corporation
  
 Corporation Mitel Networks
  
 Corporation Mitel Networks/Mitel Networks
Corporation
	 	Morgan Stanley & Co. Incorporated	 	Alberta	 	07080740967	 	All present and after-acquired personal property of the debtor. Proceeds: accounts, chattel paper, money, intangibles, goods documents of title, instruments and
investment property (all as defined in the Alberta Personal Property Security Act), and insurance proceeds.	 	8/7/2007

											
	 Debtor
	 	 Secured Party
	 	 Jurisdiction
	 	 Registration Number
	 	 Scope of Lien
	 	 File Date

	 Mitel Networks Corporation/ Corporation Mitel Networks
  
 Mitel Networks Corporation
  
 Corporation Mitel Networks
  
 Corporation Mitel Networks/Mitel Networks
Corporation
	 	Morgan Stanley & Co. Incorporated	 	Manitoba	 	200714504206	 	All of the debtor’s present and after-acquired personal property	 	8/8/2007
						
	 Mitel Networks Corporation/ Corporation Mitel Networks
  
 Mitel Networks Corporation
  
 Corporation Mitel Networks
  
 Corporation Mitel Networks/Mitel Networks
Corporation
	 	Morgan Stanley & Co. Incorporated	 	Nova Scotia	 	12799235	 	All of the debtor’s present and after-acquired personal property	 	8/7/2007
						
	Mitel Networks Inc.	 	Morgan Stanley & Co. Incorporated	 	Ontario	 	 File No. 637868745
 20070802180015909187
	 	All of the debtor’s present and after-acquired personal property	 	8/02/2007

											
	 Debtor
	 	 Secured Party
	 	 Jurisdiction
	 	 Registration Number
	 	 Scope of Lien
	 	 File Date

	 Mitel Networks Corporation/Corporation Mitel Networks
  
 Mitel Networks Corporation
  
 Corporation Mitel Networks
  
 Corporation Mitel Networks/Mitel Networks
Corporation
	 	Morgan Stanley & Co. Incorporated	 	British Columbia	 	840079D	 	All present and after-acquired personal property of the debtor and, without limitation, all fixtures, crops and licences	 	8/07/2007

 Schedule 3 
 FEES AND EXPENSES 
  

				
	 Allen & Overy LLP
	  	US$	97,923.79
	 Faskin Martineau Dumoulin LLP
	  	US$	 1,409.81
		  	 	 
	 Total Payoff Amount
	  	US$	99,333.60

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