Document:

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                                                                   EXHIBIT 10.30

                   FIFTH AMENDMENT TO STOCKHOLDERS' AGREEMENT

     This Fifth Amendment (this "Amendment"), dated as of May 22, 2006, to the
Original Agreement (as defined below) is by and among DLJ Merchant Banking
Partners, L.P., DLJ International Partners, C.V., DLJ Offshore Partners, C.V.,
DLJ Merchant Banking Funding, Inc., DLJ Capital Corporation, DLJ First ESC,
L.P., DLJ ESC II, L.P., Sprout Growth II, L.P., Sprout Capital VII, L.P., Sprout
Capital IX, L.P., Sprout Entrepreneurs' Fund, L.P., Sprout IX Plan Investors,
L.P., Sprout CEO Fund L.P., Thomas J. Barry, Larry Cormier, Randy Fodero, Robert
Freiburghouse, Bob Gailus, N. Robert Hammer, David H. Ireland, Lou Miceli, Tom
Miller, Scotty R. Neal and CommVault Systems, Inc., a Delaware corporation.

                                   WITNESSETH:

     WHEREAS, the parties hereto previously entered into a Stockholders'
Agreement, dated as of May 22, 1996, as amended by the First Amendment thereto,
dated July 23, 1998, the Second Amendment thereto, dated November 6, 2000, the
Third Amendment thereto, dated February 14, 2002, and the Fourth Amendment
thereto, dated September 2, 2003 (as so amended, the "Original Agreement");

     WHEREAS, the parties hereto desire to amend the Original Agreement to
extend certain provisions of the Original Agreement as set forth herein; and

     WHEREAS, in compliance with Section 6.4(a) of the Original Agreement, this
Amendment has been approved by the Board and the signatories hereto represent
holders of at least 85% of the Fully Diluted Common Stock held by parties to the
Original Agreement.

     NOW THEREFORE, the parties hereto agree that the Original Agreement shall
be amended as follows:

Section 1. Definitions. Capitalized terms used but not defined herein shall have
the meaning assigned such terms in the Original Agreement.

Section 2. Extension. Each provision of the Original Agreement that was in full
force and effect immediately prior to the execution of this Amendment, and had
not expired or terminated pursuant to its terms prior to the date hereof, shall
hereby be extended, and the rights and obligations set forth in each such
provision shall continue in full force and effect, until the earlier of (a) the
first anniversary of the date of this Amendment and (b) the consummation of an
Initial Public Offering.

Section 3. Miscellaneous.

     (a) This Amendment shall be binding upon and shall inure to the benefit of
the parties to the Original Agreement.

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     (b) This Amendment may be executed in any number of counterparts, each of
which shall be deemed to be an original and all of which together shall be
deemed one and the same instrument.

                                      *****

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

                                        DLJ MERCHANT BANKING PARTNERS, L.P.

                                        By: DLJ Merchant Banking, Inc.
                                        Managing General Partner

                                        By: /s/ Goerge R. Hornig
                                            ------------------------------------
                                        Name: George R. Hornig
                                        Title: Attorney-In-Fact

                                        DLJ INTERNATIONAL PARTNERS, C.V.

                                        By: DLJ Merchant Banking, Inc.
                                        Advisory General Partner

                                        By: /s/ George R. Hornig
                                            ------------------------------------
                                        Name: George R. Hornig
                                        Title: Attorney-In-Fact

                                        DLJ OFFSHORE PARTNERS, C.V.

                                        By: DLJ Merchant Banking, Inc.
                                        Advisory General Partner

                                        By: /s/ George R. Hornig
                                            ------------------------------------
                                        Name: George R. Hornig
                                        Title: Attorney-In-Fact

                                        DLJ MERCHANT BANKING FUNDING, INC.

                                        By: /s/ George R. Hornig
                                            ------------------------------------
                                        Name: George R. Hornig
                                        Title: President

<PAGE>

                                        DLJ CAPITAL CORPORATION

                                        By: /s/ Amy Yeung
                                            ------------------------------------
                                        Name: Amy Yeung
                                              Vice President

                                        DLJ FIRST ESC, L.P.

                                        By: DLJ LBO Management Corporation,
                                        its General Partner

                                        By: /s/ George R. Hornig
                                            ------------------------------------
                                        Name: George R. Hornig
                                        Title: President

                                        DLJ ESC II, L.P.

                                        By: DLJ LBO Management Corporation,
                                        its General Partner

                                        By: /s/ George R. Hornig
                                            ------------------------------------
                                        Name: George R. Hornig
                                        Title: President

                                        SPROUT GROWTH II, L.P.

                                        By: DLJ Capital Corporation
                                        Managing General Partner

                                        By: /s/ Amy M. Yeung
                                            ------------------------------------
                                        Name: Amy M. Yeung
                                              Vice President

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                                        SPROUT CAPITAL VII, L.P.

                                        By: DLJ Capital Corporation
                                        Managing General Partner

                                        By: /s/ Amy M. Yeung
                                            ------------------------------------
                                        Name: Amy M. Yeung
                                              Vice President

                                        SPROUT CAPITAL IX, L.P.

                                        By: DLJ Capital Corporation
                                        Managing General Partner

                                        By: /s/ Amy M. Yeung
                                            ------------------------------------
                                        Name: Amy M. Yeung
                                              Vice President

                                        SPROUT IX PLAN INVESTORS, L.P.

                                        By: DLJ Capital Corporation
                                        Managing General Partner

                                        By: /s/ Amy M. Yeung
                                            ------------------------------------
                                        Name: Amy M. Yeung
                                              Attorney-In-Fact

                                        SPROUT CEO FUND L.P.

                                        By: DLJ Capital Corporation
                                        Managing General Partner

                                        By: /s/ Amy M. Yeung
                                            ------------------------------------
                                        Name: Amy M. Yeung
                                              Vice President

<PAGE>

                                        SPROUT ENTREPRENEURS' FUND

                                        By: DLJ Capital Corporation
                                        Managing General Partner

                                        By: /s/ Amy M. Yeung
                                            ------------------------------------
                                        Name: Amy M. Yeung
                                              Vice President

                                        ----------------------------------------
                                        THOMAS J. BARRY

                                        ----------------------------------------
                                        LARRY CORMIER

                                        ----------------------------------------
                                        RANDY FODERO

                                        ----------------------------------------
                                        ROBERT FREIBURGHOUSE

                                        ----------------------------------------
                                        BOB GAILUS

                                        ----------------------------------------
                                        N. ROBERT HAMMER

                                        ----------------------------------------
                                        DAVID H. IRELAND

                                        ----------------------------------------
                                        LOU MICELI

<PAGE>

                                        ----------------------------------------
                                        TOM MILLER

                                        ----------------------------------------
                                        SCOTTY R. NEAL

                                        COMMVAULT SYSTEMS, INC.

                                        By: /s/ N. Robert Hammer
                                            ------------------------------------
                                        Name: N. Robert Hammer
                                        Title: PresidentEX-10.1

 

Exhibit 10.1

Mr. Andreas Pohlmann

Celanese Corporation

Dallas, Texas

June 30, 2006

Dear Andreas:

This letter will set out the terms and agreements between you and Celanese Corporation and Celanese
AG regarding the amicable voluntary agreed termination of your employment including the termination
of your employment with Celanese AG and any of its subsidiaries or affiliates. Those specific
understandings and agreements are as follows.

Following our conversation we have determined that, in particular, the following documents have
been entered into between Celanese and you: your US Employment Agreement dated February 23, 2005,
the (alignment) bonus letter agreement dated February 24/25, 2005, the Subscription Agreement dated
as of January 21, 2005, the Employee Stockholder Agreement dated as of January 21, 2005, the
Deferral Agreement dated January 21, 2005 based upon the Celanese Corporation Deferred Compensation
Plan (undated), the Nonqualified Stock Option Agreement dated January 21, 2005 based upon the 2004
Stock Incentive Plan (undated), the Letter of Understanding dated October 27, 2004 and the board
contract (Vorstandsdienstvertrag) dated February 25, 2005 with Celanese AG.

We deem this agreement to be written amicable termination of your employment as of December 31,
2006. This includes the termination of any employment relationship (if any) you may have with
Celanese AG, Celanese International, Celanese Corporation or any of its direct or indirect
affiliates or subsidiaries. Consequently, you only are entitled to the following payments in
connection with your termination of employment from Celanese on December 31, 2006:

	A.	 	Employment Agreement and related agreements (ex Management Incentive Program)
	 
	1.	 	We will continue to pay your base salary up to December 31, 2007.
	 
	2.	 	You will receive annual bonus payments for fiscal year 2006 based on goals achieved and
personal performance, payable in March 2007. Although your responsibilities have been reduced
the determination of your 2006 bonus will be based on your current level as a member of the
OTC. Additionally you will receive a bonus based on target level, i.e. equal to 80% of the
current

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Mr. Andreas Pohlmann

June 30, 2006

	 	 	annual base salary, for January to December 2007, payable in December 2007.
	 
	3.	 	You will receive all entitlements according to your Letter of Understanding dated October 27,
2004 on the date such events occur.
	 
	4.	 	You will receive the remaining alignment bonus payments of $927,500 on January 1, 2007.
	 
	5.	 	We will maintain your accident insurance cover until December 31, 2007 to the extent allowed
by the applicable insurer and policy terms.
	 
	6.	 	For pension purposes, we will consider the time from October 16, 1989 until December 31, 2007
as years of service.

I wish to remind you that you acknowledge that the terms of your Confidentiality Agreement with
Celanese remain in effect following the termination of your employment, and you agree not to accept
any future employment which would require you to violate that Agreement. You reaffirm your
obligations under, and agree to comply with, the terms of each of the above referenced agreements
which apply during your employment or after the termination of your employment, including but not
limited to any agreement not to compete with Celanese, not to recruit or solicit customers or
employees, or reveal any confidential information or trade secrets, and assignment of inventions
and works of authorship, and agree all those provisions continue to apply notwithstanding the
circumstances of your employment termination or any other events occurring prior to this date. For
the avoidance of doubt, it is agreed that the payments provided for under this letter agreement
will be deemed to satisfy any non-compete compensation or other payment obligation that may be
required for these provisions to be enforceable.

	B.	 	Management Incentive Program

Additionally, under the terms of the Celanese Corporation Deferred Compensation Plan and the 2004
Incentive Plan you will be entitled to certain payments and or considerations in connection with
your termination from Celanese:

	1.	 	For purposes of these plans generally your termination is considered for “Good Reason” on
account of corporate restructuring or reorganization. We further recognize that for the year
2005 both the Tier II EBITDA and the Tier II FCF Target have been achieved.

	2.	 	We confirm that according to sec. 4.4 (b) (i) of the Deferred Compensation Plan, your
termination of employment shall be deemed

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Mr. Andreas Pohlmann

June 30, 2006

	 	 	to have occurred on the Time Condition Date of December 31, 2006, and with regard to sec.
4.4 (b) (ii) on the Performance Condition Date of December 31, 2006.
	 
	3.	 	Payout under the terms of the Celanese Corporation Deferred Compensation Plan will take place
on January 1, 2007 for the 2005 entitlement of $5,198,614 and for the 2006 entitlement of
$5,198,614. The calculation of the 2006 amount is based on the assumption of achieving both
the Tier II EBITDA and the Tier II FCF targets. Should the actual results not achieve those
targets, you will be obliged to pay back the respective “over-payment” in March 2007.
	 
	4.	 	For stock option purposes only, in particular with regard to sec. 3 (c) of the Nonqualified
Stock Option Agreement you will be treated as if your employment terminates as of December 31,
2006, regardless of the actual Termination Date. We confirm that 152,077 options vested on the
grant date already. Additionally 263,600 stock options for 2005 have vested in 2006 and
another 263,600 stock options will deemed to have vested on December 31, 2006. Stock options
planned to vest for 2007 and beyond will forfeit.
	 
	5.	 	As of December 31, 2006, the lock-up conditions of the Employee Stockholders Agreement dated
January 21, 2005, both with regard to the 148,007 Shares you subscribed for in January 2005
and with regard to any other shares which might be subject to the Employee Stockholders
Agreement, will be lifted.
	 
	6.	 	In an exit event of Blackstone or a change in control event prior to December 31, 2006, your
compensation from the Management Incentive Program will be as set forth in the terms and
conditions of those plans and agreements.
	 
	C.	 	General Terms
	 
	1.	 	The above payments will be made to you via direct deposit to your bank account of record at
Celanese or any other account so designated by you. If you die before all payments according
to this agreement have been made, all amounts owed to you under this agreement that have not
otherwise been paid, shall be paid to your estate (or a beneficiary you designate to Celanese
Corporation HR in writing).
	 
	2.	 	This agreement is the entire agreement between the Company and you relating to your
separation from employment, and supersedes any and all prior oral or written communications or
agreements concerning your separation from employment. It is being entered into by each of the
parties for valuable consideration, specified herein, which is in addition to whatever either
party may be entitled under any existing agreement. Neither this agreement nor any of its
terms may be amended, changed, waived or added to

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Mr. Andreas Pohlmann

June 30, 2006

	 	 	except in a writing signed by both parties. The Company has made no representations or
promises to you other than those in or referred to by this Termination Letter. If any
provision in this Termination Letter is found to be unenforceable, all other provisions will
remain enforceable.

	3.	 	We are not entitled to exercise a right of set-off or retention with respect to any of our
payment obligations according to this agreement. To the extent necessary to avoid any adverse
income tax consequences to you under the United States Internal Revenue Code, any payment
required hereunder will be delayed upon your request until the first day after the six month
anniversary of the date your employment terminates.
	 
	4.	 	You hereafter will cooperate and consult with and assist Celanese and its attorneys and
agents, and provide advice, truthful information, interviews and testimony, with respect to
any business or events occurring during your employment. This will be done at such times and
in such manner as we may reasonably request upon whatever notice is reasonable under the
circumstances. If and to the extent you are requested to travel outside the metropolitan area
where you live, then we will pay all reasonable and necessary travel and lodging expenses you
incur associated with that request. We will endeavor to require this assistance at such times
and in such a manner as will not unreasonably interfere with your obligations to another
employer to the extent feasible. In the case where there would be unreasonable interference,
such that you are required to be away from your position for more than several consecutive
days, then you will be compensated for the excess time on an hourly basis consistent with your
last base salary with Celanese.
	 
	5.	 	The above referenced agreements of Celanese fully satisfy any and all known and unknown
claims and rights you may have against Celanese Corporation, Celanese AG, their respective
shareholders, subsidiaries and affiliates, and the respective present and former directors,
officers and agents of each such business entity, in any way arising out of or based upon any
promise, agreement, decision or conduct of any such person or entity or any facts occurring
prior to this date, and you specifically waive, give up and release (and agree not to
prosecute or sue on) any and all such known and unknown claims and lawsuits you may have
against any of them. This includes a release of any claims and lawsuits under the laws of the
United States, the laws of the States of New York, Delaware, and Texas, the laws of Germany,
and the laws of any other country, state or municipality. You further agree to execute such
documents and take such other actions as Celanese may request in order to release and give up
any claims or rights to sue under the laws of Germany or any of its political subdivisions.
You agree that Celanese Corporation, Celanese AG and the other persons you have released have
not

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Mr. Andreas Pohlmann

June 30, 2006

	 	 	retaliated against you on account of any conduct or statement by you, and that you have not
been discriminated against nor treated adversely in connection with your employment on
account of your age, gender, race, national origin or any other legally protected
classification.
	 
	6.	 	You hereafter will continue to conduct yourself in a professional and positive manner with
respect to Celanese Corporation and its directors and officers, and will not criticize or say
anything disparaging about Celanese Corporation or any of its officers, directors, or
principal shareholders to any customer, current or former employee, lender, or other third
party. Celanese Corporation in turn will direct its current senior executive officers not to
criticize or say anything disparaging about you to any customer, former employee or other
third party. This will not however prevent you or any Celanese officer from providing truthful
information or testimony to any governmental official or body (or in the case of any Celanese
officer, to any investor or investment analyst), including but not limited to the Securities
Exchange Commission. Celanese will provide you with an adequate record of your services
(Zeugnis) as it is customary in Germany satisfying the expectations associated with the senior
management position you held with the company.
	 
	7.	 	In case one of the clauses proves in total or in part to be invalid or unenforceable or
unworkable, it shall be replaced by the parties with a valid, enforceable and workable
provision which shall come as close as possible to the resolution of the issue which the
parties intended to settle with the respective invalid, unenforceable of unworkable clause.
	 
	8.	 	This letter agreement is subject to the approval of the Compensation Committee of Celanese
Corporation and shall not be binding until such approval is received.

On behalf of Celanese, thank you for your valuable service to the Company. We wish you much success
in your future endeavors. Please confirm your agreement to the foregoing by signing below where
indicated.

We expect the supervisory board of Celanese AG to approve and confirm the details of this agreement
by signature of the Chairman (Vorsitzender des Aufsichtsrates der Celanese AG).

Yours truly,

CELANESE CORPORATION

By

/s/ David N. Weidman

Page 5

 

Mr. Andreas Pohlmann

June 30, 2006

	 	 	 
	David N. Weidman
	 	 
	Chief Executive Officer, President and Director
	 	 
	 
	 	 
	CELANESE AG

	 	Accepted and Agreed:
	 
	 	 
	By

	 	By
	 
	 	 
	/s/ Dr. Bernd Theimann

	 	/s/ Andreas Pohlmann
	Dr. Bernd Thiemann
	 	 
	Vorsitzender des Aufsichtsrates der Celanese AG

	 	 Andreas Pohlmann

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