Exhibit 10.51

[FORM OF NON-OFFICER PERFORMANCE SHARE AGREEMENT]

POLYCOM, INC.

PERFORMANCE SHARE AGREEMENT

[NAME]

Employee ID Number: [Number]

NOTICE OF GRANT

Polycom, Inc. (the Company) hereby grants you, [Name] (the Employee), an award of Performance Shares under the Companys 2004 Equity Incentive Plan (the
Plan). The date of this Performance Share Agreement (the Agreement) is [DATE](the Grant Date). Subject to the provisions of Appendix A (attached), Appendix B (attached) and of the Plan, the principal
features of this award are as follows:



|                                     |  |                                                                                                                                                                                                                                                                          
|------------------------------------ |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Target Number of Performance Shares: |  | [________]                                                                                                                                                                                                                                                               
|                                     | 
|Performance Period:                  |  | [INSERT PERFORMANCE PERIOD]                                                                                                                                                                                                                                              
|                                     | 
|Performance Matrix:                  |  | The number of Performance Shares in which you may vest in accordance with the Vesting Schedule will depend upon achievement of [INSERT DESCRIPTION OF PERFORMANCE GOALS] and
will be determined in accordance with the Performance Matrix, attached hereto as Appendix B.
|                                     | 
|Vesting Schedule:                    |  | [INSERT DESCRIPTION OF VESTING SCHEDULE]*                                                                                                                                                                                                                                

IMPORTANT:



|* | Except as otherwise provided in Appendix A, Employee will not vest in the Performance Shares unless he or she is employed by the Company or one of its Subsidiaries
through the applicable vesting date.
|- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Your signature below indicates your agreement and understanding
that this award is subject to all of the terms and conditions contained in Appendix A, Appendix B and the Plan. For example, important additional information on vesting and forfeiture of the Performance Shares is contained in paragraphs 3
through 5 and paragraph 7 of Appendix A. PLEASE BE SURE TO READ ALL OF APPENDIX A, WHICH CONTAINS THE SPECIFIC TERMS AND CONDITIONS OF THIS AGREEMENT.



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|                         |  |  |  |                         
|------------------------ |  |  |  | ------------------------
|POLYCOM, INC.            |  |  |  | EMPLOYEE                
|                         |  | 
|                         |  |  |  |                         
|[NAME]                   |  |  |  | [NAME]                  
|                         |  | 
|                         |  |  |  |                         
|[TITLE]                  |  |  |  |                         
|                         |  | 
|Date: ___________, 20___ |  |  |  | Date: ___________, 20___



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APPENDIX A

TERMS AND CONDITIONS OF PERFORMANCE SHARES

1.
Grant. The Company hereby grants to the Employee under the Plan an award of the Target Number of Performance Shares set forth on the Notice of Grant, subject to all of the terms and conditions in this Agreement and the Plan. The Performance
Shares in which the Employee may vest shall depend upon achievement of [INSERT DESCRIPTION OF PERFORMANCE GOALS] for the Performance Period and shall be determined in accordance with the Performance Matrix, attached hereto as Appendix B. In
accordance with the Performance Matrix, the number of the Performance Shares in which the Employee may vest will range [INSERT APPLICABLE RANGE]. The number of such Shares shall be determined by the Committee following the end of the
Performance Period, and shall be certified by the Committee following the end of each Performance Period. When Shares are paid to the Employee in payment for the Performance Shares, par value will be deemed paid by the Employee for each Performance
Share by past services rendered by the Employee, and will be subject to the appropriate tax withholdings. Unless otherwise defined herein, capitalized terms used herein shall have the meanings ascribed to them in the Plan.

(a) As used herein, [INSERT APPLICABLE DEFINITIONS].

2. Companys Obligation to Pay. Each Performance Share has a value equal to the Fair Market Value of a Share on the date that
the Performance Share is granted. Unless and until the Performance Shares have vested in the manner set forth in paragraphs 3 through 5, the Employee will have no right to payment of such Performance Shares. Prior to actual payment of any
vested Performance Shares, such Performance Shares will represent an unsecured obligation. Payment of any vested Performance Shares shall be made in whole Shares only.

3. Vesting Schedule/Period of Restriction. Except as provided in paragraphs 4 and 5, and subject to paragraph 7, the Performance Shares awarded by this Agreement shall vest in accordance with the
vesting provisions set forth on the first page of this Agreement. Performance Shares shall not vest in the Employee in accordance with any of the provisions of this Agreement unless the Employee shall have been continuously employed by the Company
or by one of its Subsidiaries from the Grant Date until the date the Performance Shares are otherwise scheduled to vest.

4.
Modifications to Vesting Schedule.

(a) Vesting upon Leave of Absence.In the event that the
Employee takes an authorized leave of absence (LOA), the Performance Shares awarded by this Agreement that are scheduled to vest shall be modified as follows:

(i) if the duration of the Employees LOA is sixty (60) days or less, the vesting schedule set forth on the first
page of this Agreement shall not be affected by the Employees LOA.



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(ii) if the duration of the Employees LOA is greater than sixty
(60) days, the scheduled vesting of any Performance Shares awarded by this Agreement that are not then vested shall be deferred for a period of time equal to the duration of the Employees LOA.

(b) Death or Disability of Employee. In the event that the Employee incurs a Termination of Service due to his or her
death or Disability during a Performance Period, the Employee shall immediately vest [INSERT DESCRIPTION OF VESTING CONDITIONS].

In the event that any applicable law limits the Companys ability to accelerate the vesting of this award of Performance Shares, this paragraph 4(b) shall be limited to the extent required to comply
with applicable law.

(c) Change in Control.

(i) In the event of a Change in Control, this award shall be subject to the definitive agreement governing such Change in
Control. Such agreement, without the Employees consent and notwithstanding any provision to the contrary in this Agreement or the Plan, must provide for one of the following: (a) the assumption of this award by the surviving corporation
or its parent; (b) the substitution by the surviving corporation or its parent of an award with substantially the same terms as this award; or (c) the cancellation of this award after payment to the Employee in Shares of an amount equal to
the Performance Shares subject to this award at the time of the Change in Control. In the event the definitive agreement does not provide for one of the foregoing alternatives with respect to the treatment of this award, this award shall have the
treatment specified in clause (c) of the preceding sentence. The Committee may, in its sole discretion, accelerate the vesting of this award in connection with any of the foregoing alternatives. For purposes of this Agreement, Change in
Control means the occurrence of any of the following events: (a) any person (as such term is used in Sections 13(d) and 14(d) of the 1934 Act) becomes the beneficial owner (as defined in Rule 13d-3 of the 1934
Act), directly or indirectly, of securities of the Company representing more than fifty percent (50%) of the total voting power represented by the Companys then outstanding voting securities; (b) the consummation of the sale or
disposition by the Company of all or substantially all of the Companys assets; (c) a change in the composition of the Board occurring within a one-year period, as a result of which fewer than a majority of the directors are Incumbent
Directors; or (d) the consummation of a merger or consolidation of the Company with any other corporation, other than a merger or consolidation which would result in the voting securities of the Company outstanding immediately prior thereto
continuing to represent (either by remaining outstanding or by being converted into voting securities of the surviving entity or its parent) at least fifty percent (50%) of the total voting power represented by the voting securities of the
Company or such surviving entity or its parent outstanding immediately after such merger or consolidation. Incumbent Directors means directors who either (A) are Directors as of the effective date of the Plan, or (B) are
elected, or nominated for election, to the Board with the affirmative votes of at least a majority of the Directors at the time of such election or nomination (but will not include an individual whose election or nomination is in connection with an
actual or threatened proxy contest relating to the election of directors to the Company).

(ii) Notwithstanding
anything herein to the contrary, in the event the Employee incurs a Termination of Service within twelve (12) months following a Change in Control on account of a termination by the Company (or any Subsidiary) for any reason other than
Misconduct, then this award immediately will vest in one hundred percent (100%) of the Performance Shares subject to this Performance Share award.



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For purposes of this Agreement, Misconduct means (a) the
commission of any act of fraud, embezzlement or dishonesty by the Employee, (b) the Employees conviction of, or plea of nolo contendre to, a felony, (c) any unauthorized use or disclosure by the Employee of confidential information
or trade secrets of the Company or of any Subsidiary, or (d) any other intentional misconduct by the Employee adversely affecting the business or affairs of the Company or of any Subsidiary in a material manner. The preceding definition shall
not be deemed to be inclusive of all the acts or omissions that the Company (or any Subsidiary) may consider as grounds for the dismissal or discharge of the Employee or any other individual in the service of the Company (or any Subsidiary).

(iii) In the event of a Change in Control during any Performance Period, all Performance Periods shall be
deemed to end immediately prior to the Change in Control and the number of Performance Shares in which the Employee shall be entitled to vest in accordance with the terms of this Agreement and the Vesting Schedule set forth on the Notice of Grant
shall be one hundred percent (100%) of the Target Number of Performance Shares (as set forth on the Notice of Grant) less the number of vested Performance Shares.

5. Committee Discretion. The Committee, in its discretion, may accelerate the vesting of the balance, or some lesser portion of the balance, of the Performance Shares at any time, subject to the
terms of the Plan. If so accelerated, such Performance Shares will be considered as having vested as of the date specified by the Committee. If the Committee, in its discretion, accelerates the vesting of the balance, or some lesser portion of the
balance, of the Performance Shares and the Performance Shares are deferred compensation within the meaning of Section 409A, the payment of such accelerated Performance Shares nevertheless shall be made at the same time or times as
if such Performance Shares had vested in accordance with the vesting schedule set forth on the first page of this Agreement (whether or not the Employee remains employed by the Company or by one of its Subsidiaries as of such date(s)).
Notwithstanding the foregoing, if such Performance Shares are accelerated in connection with the Employees Termination of Service (other than due to death), the Performance Shares that vest on account of the Employees Termination of
Service will not be considered due or payable until the Employee has a separation from service within the meaning of Section 409A. In addition, if the Employee is a specified employee within the meaning of
Section 409A at the time of the Employees separation from service, then any such accelerated Performance Shares otherwise payable within the six (6) month period following the Employees separation from service instead will be
paid on the date that is six (6) months and one (1) day following the date of the Employees separation from service, unless the Employee dies following his or her separation from service, in which case, the accelerated Performance
Shares will be paid to the Employees estate as soon as practicable following his or her death, subject to paragraph 9. Thereafter, such Performance Shares shall continue to be paid in accordance with the vesting schedule set forth on the first
page of this Agreement. For purposes of this Agreement, Section 409A means Section 409A of the U.S. Internal Revenue Code of 1986, as amended, and any final Treasury Regulations and other Internal Revenue Service guidance
thereunder, as each may be amended from time to time (Section 409A).



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6. Payment after Vesting. Any Performance Shares that vest in
accordance with paragraphs 3 through 4 will be paid to the Employee (or in the event of the Employees death, to his or her estate) in Shares as soon as practicable following the date of vesting, subject to paragraph 9, but in no event
later than the applicable two and one-half (21/2) month period of the short-term deferral rule set forth in the Section 1.409A-1(b)(4) of the Treasury Regulations issued under Section 409A. Notwithstanding the foregoing, if the Performance Shares are
deferred compensation within the meaning of Section 409A, the vested Performance Shares will be released to the Employee (or in the event of the Employees death, to his or her estate) in Shares as soon as practicable following
the date of vesting, subject to paragraph 9, but in no event later than the end of the calendar year that includes the date of vesting or, if later, the fifteen (15th) day of the third (3rd) calendar month following the date of vesting
(provided that the Employee will not be permitted, directly or indirectly, to designate the taxable year of the payment). Further, if some or all of the Performance Shares that are deferred compensation within the meaning of
Section 409A vest on account of the Employees Termination of Service (other than due to death) in accordance with paragraphs 3 through 4, the Performance Shares that vest on account of the Employees Termination of Service will not
be considered due or payable until the Employee has a separation from service within the meaning of Section 409A. In addition, if the Employee is a specified employee within the meaning of Section 409A at the time
of the Employees separation from service (other than due to death), then any accelerated Performance Shares will be paid to the Employee no earlier than six (6) months and one (1) day following the date of the Employees
separation from service unless the Employee dies following his or her separation from service, in which case, the Performance Shares will be paid to the Employees estate as soon as practicable following his or her death, subject to paragraph
9. Any Performance Shares that vest in accordance with paragraph 5 will be paid to the Employee (or in the event of the Employees death, to his or her estate) in Shares in accordance with the provisions of such paragraph, subject to
paragraph 9. For each Performance Share that vests, the Employee will receive one Share.

7. Forfeiture.
Notwithstanding any contrary provision of this Agreement, the balance of the Performance Shares that have not vested [INSERT DESCRIPTION OF VESTING SCHEDULE] will be forfeited and automatically transferred to and reacquired by the Company at
no cost to the Company.

8. Death of Employee. Any distribution or delivery to be made to the Employee under this
Agreement will, if the Employee is then deceased, be made to the administrator or executor of the Employees estate. Any such administrator or executor must furnish the Company with (a) written notice of his or her status as transferee,
and (b) evidence satisfactory to the Company to establish the validity of the transfer and compliance with any laws or regulations pertaining to said transfer.

9. Withholding of Taxes. When Shares are issued as payment for vested Performance Shares, the Company (or the employing Subsidiary) will withhold a portion of the Shares that have an aggregate
market value sufficient to pay federal, state, local and foreign income, social insurance, employment and any other applicable taxes required to be withheld by the Company or the employing Subsidiary with respect to the Shares, unless the Company,
in its sole discretion, either requires or otherwise permits the Employee to make alternate arrangements satisfactory to the Company for such withholdings in advance of the arising of any withholding obligations. The number of Shares withheld
pursuant to the prior sentence will be rounded up to the nearest whole



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Share, with no refund for any value of the Shares withheld in excess of the tax obligation as a result of such rounding. Notwithstanding any contrary provision of this Agreement, no Shares will
be issued unless and until satisfactory arrangements (as determined by the Company) have been made by the Employee with respect to the payment of any income and other taxes which the Company determines must be withheld or collected with respect to
such Shares. In addition and to the maximum extent permitted by law, the Company (or the employing Subsidiary) has the right to retain without notice from salary or other amounts payable to the Employee, cash having a sufficient value to satisfy any
tax withholding obligations that the Company determines cannot be satisfied through the withholding of otherwise deliverable Shares. All income and other taxes related to the Performance Shares award and any Shares delivered in payment thereof are
the sole responsibility of the Employee. By accepting this award, the Employee expressly consents to the withholding of Shares and to any additional cash withholding as provided for in this paragraph 9.

10. Rights as Stockholder. Neither the Employee nor any person claiming under or through the Employee will have any of the rights or
privileges of a stockholder of the Company in respect of any Shares deliverable hereunder unless and until certificates representing such Shares (which may be in book entry form) will have been issued, recorded on the records of the Company or its
transfer agents or registrars, and delivered to the Employee (including through electronic delivery to a brokerage account). After such issuance, recordation and delivery, the Employee will have all the rights of a stockholder of the Company with
respect to voting such Shares and receipt of dividends and distributions on such Shares.

11. No Effect on Employment.
Subject to any employment contract with the Employee, the terms of such employment will be determined from time to time by the Company, or the Subsidiary employing the Employee, as the case may be, and the Company, or the Subsidiary employing the
Employee, as the case may be, will have the right, which is hereby expressly reserved, to terminate or change the terms of the employment of the Employee at any time for any reason whatsoever, with or without good cause. The transactions
contemplated hereunder and the vesting schedule set forth on the first page of this Agreement do not constitute an express or implied promise of continued employment for any period of time. A leave of absence or an interruption in service (including
an interruption during military service) authorized or acknowledged by the Company or the Subsidiary employing the Employee, as the case may be, shall not be deemed a Termination of Service for the purposes of this Agreement.

12. Address for Notices. Any notice to be given to the Company under the terms of this Agreement will be addressed to the Company, in
care of its General Counsel, at 4750 Willow Road, Pleasanton, CA 94588, or at such other address as the Company may hereafter designate in writing.

13. Grant is Not Transferable. Except to the limited extent provided in this Agreement, this grant of Performance Shares and the rights and privileges conferred hereby will not be sold, pledged,
assigned, hypothecated, transferred or disposed of any way (whether by operation of law or otherwise) and will not be subject to sale under execution, attachment or similar process, until the Employee has been issued Shares in payment of the
Performance Shares. Upon any attempt to sell, pledge, assign, hypothecate, transfer or otherwise dispose of this grant, or any right or privilege conferred hereby, or upon any attempted sale under any execution, attachment or similar process, this
grant and the rights and privileges conferred hereby immediately will become null and void.



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14. Restrictions on Sale of Securities. The Shares issued as payment for vested
Performance Shares under this Agreement will be registered under U.S. federal securities laws and will be freely tradable upon receipt. However, an Employees subsequent sale of the Shares may be subject to any market blackout-period that may
be imposed by the Company and must comply with the Companys insider trading policies, and any other applicable securities laws.

15. Binding Agreement. Subject to the limitation on the transferability of this grant contained herein, this Agreement will be binding upon and inure to the benefit of the heirs, legatees, legal representatives, successors and
assigns of the parties hereto.

16. Additional Conditions to Issuance of Certificates for Shares. The Company shall not
be required to issue any certificate or certificates for Shares hereunder prior to fulfillment of all the following conditions: (a) the admission of such Shares to listing on all stock exchanges on which such class of stock is then listed;
(b) the completion of any registration or other qualification of such Shares under any U.S. state or federal law or under the rulings or regulations of the Securities and Exchange Commission or any other governmental regulatory body, which the
Committee shall, in its absolute discretion, deem necessary or advisable; (c) the obtaining of any approval or other clearance from any U.S. state or federal governmental agency, which the Committee shall, in its absolute discretion, determine
to be necessary or advisable; and (d) the lapse of such reasonable period of time following the date of vesting of the Performance Shares as the Committee may establish from time to time for reasons of administrative convenience.

17. Plan Governs. This Agreement is subject to all the terms and provisions of the Plan. In the event of a conflict between one or
more provisions of this Agreement and one or more provisions of the Plan, the provisions of the Plan will govern.

18.
Committee Authority. The Committee will have the power to interpret the Plan and this Agreement and to adopt such rules for the administration, interpretation and application of the Plan as are consistent therewith and to interpret or revoke
any such rules (including, but not limited to, the determination of whether or not any Performance Shares have vested). All actions taken and all interpretations and determinations made by the Committee in good faith will be final and binding upon
the Employee, the Company and all other interested persons. No member of the Committee will be personally liable for any action, determination or interpretation made in good faith with respect to the Plan or this Agreement.

19. Captions. Captions provided herein are for convenience only and are not to serve as a basis for interpretation or construction of
this Agreement.

20. Agreement Severable. In the event that any provision in this Agreement will be held invalid or
unenforceable, such provision will be severable from, and such invalidity or unenforceability will not be construed to have any effect on, the remaining provisions of this Agreement.

21. Modifications to the Agreement. This Agreement constitutes the entire understanding of the parties on the subjects covered. The
Employee expressly warrants that he or she is not accepting this Agreement in reliance on any promises, representations, or inducements other than those contained herein. Modifications to this Agreement or the Plan can be made only in an express



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written contract executed by a duly authorized officer of the Company. Notwithstanding anything to the contrary in the Plan or this Agreement, the Company reserves the right to revise this
Agreement as it deems necessary or advisable, in its sole discretion and without the consent of the Employee, to comply with Section 409A or to otherwise avoid imposition of any additional tax or income recognition under Section 409A prior
to the actual payment of Shares pursuant to this award of Performance Shares.

22. Amendment, Suspension or Termination of
the Plan. By accepting this Performance Shares award, the Employee expressly warrants that he or she has received a right to receive stock under the Plan, and has received, read and understood a description of the Plan. The Employee understands
that the Plan is discretionary in nature and may be amended, suspended or terminated by the Company at any time.

23. Labor
Law. By accepting this Performance Shares award, the Employee acknowledges that: (a) the grant of these Performance Shares is a one-time benefit which does not create any contractual or other right to receive future grants of Performance
Shares, or benefits in lieu of Performance Shares; (b) all determinations with respect to any future grants, including, but not limited to, the times when the Performance Shares shall be granted, the number of Performance Shares subject to each
Performance Share award and the time or times when the Performance Shares shall vest, will be at the sole discretion of the Company; (c) the Employees participation in the Plan is voluntary; (d) the value of these Performance Shares
is an extraordinary item of compensation which is outside the scope of the Employees employment contract, if any; (e) these Performance Shares are not part of the Employees normal or expected compensation for purposes of calculating
any severance, resignation, redundancy, end of service payments, bonuses, long-service awards, pension or retirement benefits or similar payments; (f) the vesting of these Performance Shares will cease upon termination of employment for any
reason except as may otherwise be explicitly provided in the Plan or this Agreement; (g) the future value of the underlying Shares is unknown and cannot be predicted with certainty; (h) these Performance Shares have been granted to the
Employee in the Employees status as an employee of the Company or its Subsidiaries; (i) any claims resulting from these Performance Shares shall be enforceable, if at all, against the Company; and (j) there shall be no additional
obligations for any Subsidiary employing the Employee as a result of these Performance Shares.

24. Disclosure of Employee
Information. By accepting this Performance Shares award, the Employee consents to the collection, use and transfer of personal data as described in this paragraph. The Employee understands that the Company and its Subsidiaries hold certain
personal information about him or her, including his or her name, home address and telephone number, date of birth, social security or identity number, salary, nationality, job title, any shares of stock or directorships held in the Company, details
of all awards of Performance Shares or any other entitlement to shares of stock awarded, canceled, exercised, vested, unvested or outstanding in his or her favor, for the purpose of managing and administering the Plan (Data). The
Employee further understands that the Company and/or its Subsidiaries will transfer Data among themselves as necessary for the purpose of implementation, administration and management of his or her participation in the Plan, and that the Company
and/or any of its Subsidiaries may each further transfer Data to any third parties assisting the Company in the implementation, administration and management of the Plan. The Employee understands that these recipients may be located in the European
Economic Area, or elsewhere, such as in the U.S. The Employee authorizes the Company



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to receive, possess, use, retain and transfer the Data in electronic or other form, for the purposes of implementing, administering and managing his or her participation in the Plan, including
any requisite transfer to a broker or other third party with whom he or she may elect to deposit any Shares of stock acquired from this award of Performance Shares of such Data as may be required for the administration of the Plan and/or the
subsequent holding of Shares of stock on his or her behalf. The Employee understands that he or she may, at any time, view the Data, require any necessary amendments to the Data or withdraw the consent herein in writing by contacting the Equity
Programs Department for the Company and/or its applicable Subsidiaries.

25. Notice of Governing Law. This award of
Performance Shares shall be governed by, and construed in accordance with, the laws of the State of California, without regard to principles of conflict of laws.



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APPENDIX B

PERFORMANCE MATRIX



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