Document:

EXHIBIT
F

    

    GUARANTY
AGREEMENT

    

    THIS GUARANTY AGREEMENT
(“Guaranty”) is dated as
of ____________ ___, 2009, and is made effective as of ___________ __, 2009 (the
“Effective Date”) by the
undersigned (each hereinafter referred to as a “Guarantor” and collectively,
the “Guarantors”), in
favor of the purchasers (each a “Investor” and collectively the
“Investors”) of the 8%
exchangeable convertible notes due March 31, 2011 (the “Notes”) and the Warrants
issued pursuant to a Securities Purchase Agreement among MOBIZONE HOLDINGS LIMITED, a
Hong Kong corporation (“MobiZone Hong Kong”), the
Guarantors, certain other Persons or are parties thereto and such Investors,
dated as of June 1, 2009  (the “Securities Purchase
Agreement”) and the Exhibits to the Securities Purchase Agreement, all
dated as of June 1, 2009 (with the Securities Purchase Agreement, collectively,
the “Investment
Documents”).

    

    Unless otherwise defined in this
Guaranty, all capitalized terms when used herein shall have the same meaning as
is defined in the Securities Purchase Agreement.

    

    NOW, THEREFORE, as a material
inducement to each Investor to purchase the Notes from the Company and the
Warrants from Trestle, and for further good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the Guarantors hereby,
unconditionally, irrevocably and absolutely, warrant and represent to and
covenant with the Investors as follows:

    

    1.           Guaranty
of Obligation.  The Guarantors
jointly, severally, unconditionally, irrevocably and absolutely, guarantee to
the Investors that:

    

    (a) all indebtedness and other
obligations of the Company evidenced by or provided in the Note (the “Payment Obligation”)
and

    

    (b) each of the consummation of (i)
the “Trestle Reverse Split” (as defined in the Purchase Agreement), (ii) the
filing of an amended and restated certificate of incorporation of Trestle and
the Series A Preferred Stock Certificate of Designations (as defined) of Trestle
with the Secretary of State of the State of Delaware, (iii) the payment of
accrued interest on the Notes, and (iv) the delivery to each Investor of their
respective rights to shares of Series A Preferred Stock, all as required under
the Securities Purchase Agreement (collectively, the “Performance Obligations” and
together with the Payment Obligation, the “Guaranteed
Obligations”),

    

    will be
promptly paid when due and performed in accordance with the terms and provisions
thereof (and as they may be amended, extended or renewed from time to time)
including, without limitation, interest on all of the above amounts as agreed
upon between the Company and the Investors, and any and all renewals, extensions
and rearrangements of all or any part of the Guaranteed
Obligations.  This is a continuing guaranty and shall continue to
apply without regard to the form or amount of indebtedness or obligation which
the Company may create, renew, extend or alter in whole or in part, without
notice to the Guarantors.

    

    2.           Liability
for Other Indebtedness.  If the Guarantors
are or become liable for any indebtedness owing by the Company to any or all
Investors by endorsement or otherwise than under this Guaranty, such liability
shall not be in any manner impaired or affected hereby, and the rights of such
Investor hereunder shall be cumulative of any and all other rights that such
Investor may ever have against the Guarantors.  The exercise by such
Investor of any right or remedy hereunder or under any other instrument, or at
law or in equity, shall not preclude the concurrent or subsequent exercise of
any other right or remedy.

    
      
         

      

      
         

        
          

        

      

      
         

      

    

    3.           No
Release From Obligations.  The obligations,
covenants, agreements and duties of the Guarantors under this Guaranty shall not
be released or impaired in any manner whatsoever, without the written consent of
the Investors, including on account of any or all of the following:

    

    a.           any
permitted assignment, endorsement or transfer, in whole or in part, of the
Guaranteed Obligations, although made without consent of the
Guarantors;

     

    b.           any
waiver by any Investor of the performance or observance by either or both of the
Company or the Guarantors of any of the agreements, covenants, terms or
conditions contained in any document evidencing, governing or securing the
Guaranteed Obligations;

     

    c.           any
extension of the time for payment or performance of all or any portion of the
Guaranteed Obligations;

     

    d.           the
renewal, rearrangement, modification or amendment (whether material or
otherwise) of any duty, agreement or obligation of the Company set forth in any
document evidencing, governing or securing the Guaranteed
Obligations;

     

    e.           the
voluntary or involuntary liquidation, sale or other disposition of all or
substantially all of the assets of either or both of the Company or the
Guarantors;

     

    f.           any
receivership, insolvency, bankruptcy, reorganization or other similar
proceedings or lack of corporate power, affecting either or both of the Company
or the Guarantors or any of their assets;

     

    g.           any
release, withdrawal, surrender, exchange, substitution, subordination or loss of
any security or other guaranty at any time existing in connection with all or
any portion of the Guaranteed Obligations, or the acceptance of additional or
substitute property as security therefore;

     

    h.           the
release or discharge of the Company or the Guarantors from the observance or
performance of any agreement, covenant, term or condition contained in any
document evidencing, governing or securing the Guaranteed
Obligations;

     

    i.           any
action which the Investors may take or omit to take by virtue of any document
evidencing, governing or securing the Guaranteed Obligations or through any
course of dealing with either or both of the Company or the
Guarantors;

     

    j.           the
addition of a new guarantor or guarantors;

     

    k.           the
operation of law or any other cause, whether similar or dissimilar to the
foregoing;

     

    l.           any
adjustment, indulgence, forbearance or compromise that may be granted or given
by the Investors to any party;

    
      
         

      

      
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    m.           the
failure by the Investors to file or enforce a claim against the estate (either
in administration, bankruptcy or other proceeding) of the Company;

     

    n.           if
the recovery from the Company becomes barred by any statute of limitations or is
otherwise prevented;

     

    o.           any
defenses, set-offs or counterclaims which may be available to the
Company;

     

    p.           any
impairment, modification, change, release or limitation of liability of, or stay
of actions of lien enforcement proceedings against the Company, its property, or
its estate in bankruptcy resulting from the operation of any present or future
provision of the Bankruptcy Code or any other similar federal or state statute,
or from the decision of any court; or

     

    q.           any
neglect, delay, omission, failure or refusal of the Investors to take or
prosecute any action for the collection of any of the Guaranteed Obligations or
to foreclose or take or prosecute any action in connection with any lien, right
of security (including perfection thereof), existing or to exist in connection
with, or as security for, any of the Guaranteed Obligations, it being the
intention hereof that the Guarantors shall remain liable as principals on the
Guaranteed Obligations, notwithstanding any act, omission or thing which might,
but for the provisions hereof, otherwise operate as a legal or equitable
discharge of any Guarantor.

     

    4.           Payment
and Performance of Obligations.  In the event of
default by the Company in payment or performance of the Guaranteed Obligations,
or any part thereof, when such indebtedness or performance becomes due, either
by its terms or as the result of the exercise of any power to accelerate, the
Guarantors shall, without notice or demand, and without any notice having been
given to the Guarantors of the acceptance by any Investor of this Guaranty and
without any notice having been given to the Guarantors of the creating or
incurring of such indebtedness, pay the amount due thereon to each Investor, at
its office, or at such other place as may be designated in writing by such
Investor, and it shall not be necessary for any Investor, in order to enforce
such payment by the Guarantors, first, to institute suit or exhaust its remedies
against the Company or others liable on such indebtedness, or to enforce its
rights against any security which shall ever have been given to secure such
indebtedness.

    

    5.           Waiver of
Notice.  Notice to the
Guarantors of the acceptance of this Guaranty and of the making, renewing or
assignment of the Guaranteed Obligations and each item thereof, are hereby
expressly waived by the Guarantors.

    

    6.           Payments
by the Company.  Each payment on
the Guaranteed Obligations shall be deemed to have been made by the Company
unless express written notice is given to the Investors at the time of such
payment that such payment is made by the Guarantors as specified in such
notice.

    

    7.           Releases
and Waivers.  If all or any
part of the Guaranteed Obligations at any time be secured, the Guarantors agree
that the Investors may at any time and from time to time, at their discretion
and with or without valuable consideration, allow substitution or withdrawal of
collateral or other security and release collateral or other security without
impairing or diminishing the obligations of the Guarantors
hereunder.  The Guarantors further agree that if the Company executes
in favor of the Investors any collateral agreement, deed of trust or other
security instrument, the exercise by the Investors of any right or remedy
thereby conferred on the Investors shall be wholly discretionary with the
Investors, and that the exercise or failure to exercise any such right or remedy
shall in no way impair or diminish the obligations of the Guarantors
hereunder.  The Guarantors further agree that the Investors shall not
be liable for their failure to use diligence in the collection of the Guaranteed
Obligations or in preserving the liability of any person liable on the
Guaranteed Obligations, and the Guarantors hereby waive presentment for payment,
protest and notice thereof, notice of acceleration, and diligence in bringing
suits against any person liable on the Guaranteed Obligations, or any part
thereof.

    
      
         

      

      
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    8.           No
Release of the Guarantors.  If the Guaranteed
Obligations at any time exceeds the amount permitted by law, or the Company is
not liable because the act of creating the Guaranteed Obligations is ultra
vires, or the officers or persons creating the Guaranteed Obligations acted in
excess of their authority, and for these reasons the Guaranteed Obligations
which the Guarantors agree to pay cannot be enforced against the Company, such
fact shall in no manner affect the Guarantors’ liability hereunder, but the
Guarantors shall be liable under this Guaranty notwithstanding that the Company
is not liable for the Guaranteed Obligations, and to the same extent the
Guarantors would have been liable if the Guaranteed Obligations had been
enforceable against the Company.

    

    9.           Optional
Acceleration.  In the Event of
Default by the Company, as such term is defined in the Securities Purchase
Agreement, and if any such Event of Default shall occur at a time when any of
the Guaranteed Obligations may not then be due and payable, such Guaranteed
Obligations, at the option of the Investors, shall thereupon be deemed to be
immediately due and payable in full, and the Guarantors shall pay to the
Investors forthwith the full amount which would be payable hereunder if all
Guaranteed Obligations were then due and payable.

    

    10.           Successors
and Assigns.  This Guaranty is
for the benefit of the Investors, their permitted successors and assigns, and in
the event of an assignment by any Investor, its permitted successors or assigns,
of the Guaranteed Obligations, or any part thereof, the rights and benefits
hereunder, to the extent applicable to the indebtedness so assigned, may be
transferred with such indebtedness.

    

    11.           Modifications
and Waivers. Cumulative Rights.  No modification,
consent, amendment or waiver of any provision of this Guaranty, nor consent to
any departure by any Guarantor therefrom, shall be effective unless the same
shall be in writing and signed by an officer of each Investor and Guarantor, and
then shall be effective only in the specific instance and for the purpose for
which given.  No notice to or demand on the Guarantors in any case
shall, of itself, entitle the Guarantors to any other or further notice or
demand in similar or other circumstances.  No delay or omission by any
Investor in exercising any power or right hereunder shall impair any such right
or power or be construed as a waiver thereof or any acquiescence therein, nor
shall any single or partial exercise of any such power preclude other or further
exercise thereof, or the exercise of any other right or power
hereunder.  All rights and remedies of the Investors hereunder are
cumulative of each other and of every other right or remedy which the Investors
may otherwise have at law or in equity or under any other contract or document,
and the exercise of one or more rights or remedies shall not prejudice or impair
the concurrent or subsequent exercise of other rights or remedies.  In
this Guaranty, whenever the context so requires, the singular number includes
the plural, and conversely.

    

    12.           Compliance
with Laws.  Should the
Guarantors be permitted to raise usury as a defense under applicable law, then
no provision herein or in the Investment Documents shall require the payment or
permit the collection of interest in excess of the maximum permitted by
law.  Should such defense be available, the Guarantors shall not be
obligated to pay the amount of such interest to the extent that it is in excess
of the amount permitted by law as to the Guarantors.  Should the
Guarantors be permitted to raise the usury defense and prevail, the Investment
Documents shall be held subject to reduction of the interest charged to the
amount allowed under said usury laws as now or hereafter construed by the courts
having jurisdiction.  The parties agree that New York law shall
control as to this issue.

    
      
         

      

      
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    13.           Benefit
to Guarantor.  The Guarantors
acknowledge and warrant that they have derived or expect to derive financial and
other advantage and benefit, directly or indirectly, from the Guaranteed
Obligations and each and every advance thereof and from each and every renewal,
extension, release of collateral or other relinquishment of legal rights made or
granted or to be made or granted by the Investors to the Company.

    

    14.           Attorney's
Fees.  The Investors
shall be entitled to recover their reasonable attorneys’ fees and expenses in
the event of any dispute between the parties arising under this Agreement in
which the Investors are the prevailing party.

    

    15.           Guarantors'
Warranties.  Each Guarantor
hereby warrants and represents to each Investor that:

    

    a.           Such
Guarantor is duly organized, validly existing and in good standing under the
laws of its jurisdiction of organization, and is duly qualified and is in good
standing in each jurisdiction in which such qualification is required by law,
other than those jurisdictions as to which the failure to be so qualified or in
good standing could not, individually or in the aggregate, reasonably be
expected to have a material adverse effect.  Such Guarantor has the
corporate or other requisite power and authority to execute and deliver this
Guaranty and to perform the provisions hereof.

     

    b.           This
Guaranty has been duly authorized by all necessary action on the part of such
Guarantor, and this Guaranty constitutes a legal, valid and binding obligation
of such Guarantor enforceable against such Guarantor in accordance with its
terms.

     

    c.           The
execution, delivery and performance by such Guarantor of this Guaranty will not
(i) contravene, result in any breach of, or constitute a default under, or
result in the creation of any lien, claim or encumbrance in respect of any
property of such Guarantor under, any indenture, mortgage, deed of trust, loan,
purchase or credit agreement, lease, corporate charter or by-laws or other
organizational document, or any other agreement or instrument to which such
Guarantor is bound or by which such Guarantor or any of its properties may be
bound or affected, (ii) conflict with or result in a breach of any of the terms,
conditions or provisions of any order, judgment, decree, or ruling of any court,
arbitrator or governmental authority applicable to such Guarantor or (iii)
violate any provision of any statute or other rule or regulation of any
governmental authority applicable to such Guarantor.

     

    d.           No
consent, approval or authorization of, or registration, filing or declaration
with, any governmental authority is required in connection with the execution,
delivery or performance by such Guarantor of this Guarantee.

     

    e.           Upon
the execution and delivery hereof, such Guarantor will be solvent, will be able
to pay its debts as they mature and will have capital sufficient to carry on its
business.

     

    16.           Subordination
and No Subrogation.  If, for any
reason whatsoever, the Company now or hereafter becomes indebted to the
Guarantors, such indebtedness and all interest thereon, shall, at all times, be
subordinate in all respects to the Investment Documents, and the Guarantors
shall not be entitled to enforce or receive payment thereof until the Guaranteed
Obligations has been fully paid and satisfied.  Notwithstanding
anything to the contrary contained in this Guaranty or any payments made by the
Guarantors hereunder, the Guarantors shall not have any right of subrogation in
or under the Investment Documents or to participate in any way therein, or any
right, title or interest in and to any mortgaged property or any collateral for
the Guaranteed Obligations, all such rights of subrogation and participation
being hereby expressly waived and released, until the Guaranteed Obligations has
been fully paid and satisfied.

    
      
         

      

      
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    17.           Law
Governing and Jurisdiction. This Agreement shall be
enforced, governed by and construed in accordance with the laws of the State of
New York applicable to agreements made and to be performed entirely within such
state, without regard to the principles of conflict of laws.  The
parties hereto hereby submit to the exclusive jurisdiction of the United States
federal courts or New York state courts located in New York, New York with
respect to any dispute arising under this Agreement, the agreements entered into
in connection herewith or the transactions contemplated hereby or thereby, and
consent to the personal jurisdiction of such courts and shall subject themselves
to such personal jurisdiction.  The parties irrevocably waive the
defense of an inconvenient forum to the maintenance of such suit or
proceeding.  The parties further agree that service of process upon a
party mailed by first class mail shall be deemed in every respect effective
service of process upon the party in any such suit or
proceeding.  Nothing herein shall affect any party’s right to serve
process in any other manner permitted by law.  The parties agree that
a final non-appealable judgment in any such suit or proceeding shall be
conclusive and may be enforced in other jurisdictions by suit on such judgment
or in any other lawful manner.  The party which does not prevail in
any dispute arising under this Agreement shall be responsible for all fees and
expenses, including attorneys’ fees, incurred by the prevailing party in
connection with such dispute.

    

    18.           Severability.  If any provision
of this Guaranty or the application thereof to any person or circumstance shall,
for any reason and to any extent, be invalid or unenforceable, neither the
remainder of this Guaranty nor the application of such provision to any other
persons or circumstances shall be affected thereby, but rather the same shall be
enforced to the greatest extent permitted by law.

    

    19.           Paragraph
Headings.  The paragraph
headings inserted in this Guaranty have been included for convenience only and
are not intended, and shall not be construed, to limit or define in any way the
substance of any paragraph contained herein.

    

    20.           Facsimile
Signature.                                           This
Agreement may be executed and delivered to the Investor containing a facsimile
signature of [      ], the President of the
Guarantors; which facsimile signature each of the Guarantors acknowledges and
agrees shall have the same validity and enforceability as those the same were a
ribbon original signature.

    

    21.           Compounding
and Settlement.  The Guarantors
agree that Investor, in its discretion, may (i) bring suit against the
Guarantors and other guarantors, if any, jointly and severally or against any
one or more of them, (ii) compound or settle with any one or more of
guarantor(s) for such consideration as the Investor may deem proper, and (iii)
release one or more of guarantor(s) from liability hereunder, and that no such
action shall impair the rights of any Investor to collect the Guaranteed
Obligations (or the unpaid balance thereof) from the Guarantors, not so sued,
settled with or released.

    

    22.           Termination.  This
Guaranty shall terminate upon the Company’s repayment in full of the Guaranteed
Obligations; provided,
however, that this Guaranty shall continue to be effective or be
reinstated, as the case may be, if at any time payment of all, or any part
thereof, of the principal of or interest on any of the Obligations is rescinded
or must otherwise be restored by any Investor, whether under any bankruptcy or
insolvency proceeding or otherwise.

    

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    IN WITNESS WHEREOF, this Guaranty has
been duly executed by the undersigned on the date set forth above.

    

      
        
          
            
              
                
                  
                    
                      
                        
                          	
                                  GUARANTORS:

                                
	 
      
	
                                  TRESTLE
      HOLDINGS, INC.

                                
	
                                  (a
      Delaware corporation)

                                
	 
      
	
                                  By:

                                	 
      
	 
      
	
                                  MOQIZONE
      HOLDINGS LIMITED

                                
	
                                  (a
      Cayman Island corporation)

                                
	 
      
	
                                  BY:

                                	 
      
	 
      
	
                                  SHANGHAI
      MOQIZONE INFORMATION

                                
	
                                  TECHNOLOGY
      COMPANY LIMITED

                                
	
                                  (a
      corporation organized under the laws of the People’s Republic of
      China)

                                
	 
      
	
                                  By:

                                	 
      
	 
      
	
                                  BORROWER:

                                
	 
      
	
                                  MOBIZONE
      HOLDINGS LIMITED

                                
	
                                  (a
      Hong Kong corporation)

                                
	 
      
	
                                  By:

                                	 
      

                        

                      

                    

                  

                

              

            

          

        

      

      
        
           

        

        
          7ESCROW
AGREEMENT

    

    THIS ESCROW AGREEMENT (“Agreement”) is
made as of June 1, 2009 by and between TRESTLE HOLDINGS,
INC., a Delaware
corporation (the "Company"); MOQIZONE HOLDINGS
LIMITED, a Cayman Island
corporation ("MoqiZone
Cayman"); all the persons
listed on Schedule A hereto (the “Management
Team”); all of the
investors who signed the Purchase Agreement, as defined below (the “Investor
Group”) and the Investor Representative who has executed this Agreement on the
Investor Signature Page hereof (the “Investor Representative,” and
together with the Investor Group, the “Investors” and together with Trestle,
MoqiZone Cayman and the Management Team, the “Parties”); and Leser, Hunter,
Taubman & Taubman, with offices at 17 State Street, Suite 1610, New York, NY
10004 (the  “Escrow Agent”).

    

    RECITALS:

    

    
      	
               
      

            	
              (1)

            	
              Pursuant
      to that certain Securities Purchase Agreement, dated as of June 1,
      2009, by and among the Company, the Investors set forth on the
      signature pages thereto, MoqiZone Cayman, Cheun Chor Kiu Lawrence
      (“Cheung”) and MKM Capital Opportunity fund Ltd. (“MKM”) (the
      “Purchase Agreement”), a copy of which is attached hereto as Exhibit B and
      incorporated herein by reference, the Investors purchased an
      aggregate of $4,345,000 of  8% Notes, convertible into
      4,345 shares of the Company’s Series A Convertible Preferred Stock
      (“Preferred Stock”), which is convertible, based on the $4,345,000
      aggregate stated value of the Preferred Stock, at a conversion price of
      $1.80 per share, into an aggregate of approximately 2,413,890 
      shares of the Company’s Common Stock subject to adjustment pursuant
      to the Certificate of Designation of the Relative Rights and
      Preferences of the Series A Convertible Preferred Stock. Capitalized terms
      used in this Agreement without definition, have the meaning assigned to
      those terms in the Purchase
Agreement;

            

    

    

    
      	
               
      

            	
              (2)

            	
              Pursuant
      to that certain Share Exchange Agreement, dated as of March 15, 2009, by
      and among the Company, MoqiZone Cayman, the MoqiZone Cayman Shareholders,
      Cheung and MKM (the “Share Exchange”), a copy of which is attached hereto
      as Exhibit
      C
      and incorporated herein by reference, the MoqiZone Cayman
      Shareholders shall own shares of Trestle Series B Preferred Stock
      that, upon consummation of the Trestle Reverse Split shall automatically
      convert into 10,743,000 shares of Trestle Common Stock, or such other
      number of shares of Trestle Common Stock as shall represent approximately
      Ninety-Five Percent (95%) of the Trestle Fully-Diluted Common
      Stock;

            

    

    

    
      	
               
      

            	
              (3)

            	
              To
      induce the Investors to enter into the Purchase Agreement, the Management
      Team has agreed to deposit an aggregate of (a) 900 shares of
      the Series B Preferred Stock and (b) upon the automatic conversion of such
      Series B Preferred Stock, the 900,000 shares of Trestle Common Stock into
      which such share of Series B Preferred Stock shall convert (the
      “Escrowed
      Shares”), as set forth in Exhibit A, in an escrow account
      immediately prior to the Closing, to be held by the Escrow Agent for
      disbursement in accordance with the terms
  herein;

            

    

     

    
      
         

      

      
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              (4)

            	
              This
      Agreement constitutes the share escrow agreement alluded to in the
      Purchase Agreement and the Share Exchange Agreement pursuant to which the
      Escrow Agent shall receive and disburse the Escrowed
    Shares.

            

    

    

    
      	
               
      

            	
              (5)

            	
              Unless otherwise defined in this
      Agreement, all capitalized terms shall have the same meaning as is defined
      in the Share Exchange
Agreement.

            

    

    

    NOW,
THEREFORE, in consideration of the covenants and mutual promises contained
herein and other good and valuable consideration, the receipt and legal
sufficiency of which are hereby acknowledged and intending to be legally bound
hereby, the parties agree as follows:

     

    ARTICLE
1

    TERMS OF
THE ESCROW

    

     
1.1            Appointment of Escrow
Holder.  The parties hereby agree to have Leser Hunter Taubman
& Taubman act as Escrow Agent whereby the Escrow Agent shall receive the
Escrow Shares in escrow and distribute the same as set forth in this
Agreement.

    

    
      	
               
      

            	
              1.2

            	
              Escrow
      Deposit

            

    

    

    
      	
               
      

            	
              (a)

            	
              In
      accordance with the terms of the Purchase Agreement, at the Initial
      closing, the Management Team shall deliver the Escrowed Shares to the
      Escrow Agent;

            

    

    
      	
               
      

            	
              (b)

            	
              The
      Escrow Agent shall hold the Escrowed Shares in the Escrow Account at all
      times until such Escrowed Shares are disbursed in accordance
      herewith.

            

    

    

    
      	
               
      

            	
              1.3

            	
              Performance
      Threshold

            

    

    

    If the
Company does not achieve the specified performance threshold, the Escrowed
Shares shall be disbursed to the Investors as set forth herein:

    

    
      	
               
      

            	
              (a)

            	
              If
      MobiZone Hong Kong shall have received from the Investors the sum of at
      least six million dollars ($6,000,000), the performance threshold is
      MoqiZone Corporations achievement of at least $19,171,000 in reported
      revenues (the “Six
      Million Target Revenue”) over the twelve consecutive months
      commencing July 1, 2009 and ending June 30, 2010 (the “Measuring
      Period”).

            

    

    
      	
               
      

            	
              (b)

            	
              If
      MobiZone Hong Kong shall have received from the Investors the sum of less
      than six million dollars ($6,000,000), the performance threshold is
      MoqiZone Corporations achievement of at least $10,450,000 in reported
      revenues (the “Lower
      Target Revenue”) over the twelve consecutive months commencing July
      1, 2009 and ending June 30, 2010 (the “Measuring
      Period”).

            

    

    
      	
               
      

            	
              (c)

            	
              The
      Six Million Target Revenue or the Lower Target Revenue shall be determined
      as of the date the Company’s financial statements for the final quarter of
      the Measuring Period are required to be filed with the Securities and
      Exchange Commission pursuant to the reporting requirements of the
      Securities Exchange Act of 1934 (the “Exchange Act”), as amended (the
      “Audit Date”).

            

    

     

    
      
         

      

      
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              1.4

            	
              Escrow
      Release

            

    

    

    The
Company and the Investor Representative shall remit written instructions to the
Escrow Agent two (2) business days after the Audit Date, in the form of Exhibit D attached
hereto and made a part hereof, or in a form and substance satisfactory to the
Escrow Agent, directing the Escrow Agent to release the Escrowed Shares within
ten (10) business days of the Audit Date, as specified therein and in accordance
with the following guidelines (the “Release Notice”):

    

    
      	
               
      

            	
              (a)

            	
              If
      the Six Million Target Revenue is met, all of the Escrowed Shares shall be
      released back to the Management
Team.

            

    

    

    
      	
               
      

            	
              (b)

            	
              In
      the event that less than the Six Million Target Revenue is realized during
      the twelve month Measuring Period, a pro-rata portion of the Escrowed
      Shares shall be distributed by the Escrow Agent to the holders of the
      Notes or Series A Preferred Stock sold in the Offering, at the rate of and
      based upon 0.2347 Escrowed Shares for each USD $1.00 that the actual
      revenues achieved by the end of the Measuring Period shall be less than
      the Six Million Target Revenue, or 45,000 Performance Shares for each 1%
      of $19,171,000 ($191,710) by which the actual revenues shall be less than
      the Six Million Target Revenue.

            

    

    

    
      	
               
      

            	
              (c)

            	
              If
      the Lower Target Revenue is met, all of the Escrowed Shares shall be
      released back to the Management
Team.

            

    

    

    
      	
               
      

            	
              (d)

            	
              In
      the event that less than the Lower Target Revenue is realized during the
      twelve month Measuring Period, a pro-rata portion of the Escrowed Shares
      shall be distributed by the Escrow Agent to the holders of the Notes or
      Series A Preferred Stock sold in the Offering, at the rate of and based
      upon 0.4306 Escrowed Shares for each USD $1.00 that the actual revenues
      achieved by the end of the Measuring Period shall be less than the Lower
      Target Revenue, or 45,000 Performance Shares for each 1% of $10,450,000
      ($104,500) by which the actual revenues shall be less than the Lower
      Target Revenue.

            

    

     

    
      	
               
      

            	
              (e)

            	
              Escrowed
      Shares will be distributed to holders of the Notes or Series A Preferred
      Stock on a pro-rata basis by which the principal amount of Notes
      originally purchased by each holder in the Offering bears to the total
      principal amount of Notes sold in the Offering to all Unit
      holders.

            

    

     

    
      
         

      

      
        3

        
          

        

      

      
         

      

    

     

    
      	
               
      

            	
              (f)

            	
              Any
      Escrowed Shares not distributed to holders of Notes or Series A Preferred
      Stock holders will be returned by the Escrow Agent to the Management Team
      at the same time as any such Escrowed Shares are distributed to holders of
      Notes or Series A Preferred Stock or as soon as practicable
      thereafter.

            

    

    

    
      	
               
      

            	
              (g)

            	
              In
      the event that the Closing does not occur and written notice of same,
      signed by all
      of the parties hereto, is delivered to the Escrow Agent or upon the
      written instructions of all
      of the parties hereto, the Escrowed Agent shall return the Escrowed Shares
      to the Management Team.

            

    

    

    
      	
               
      

            	
              (h)

            	
              Upon
      the Escrow Agent’s completion of its obligations under Section 1.4, this
      Agreement shall terminate and the Escrow Agent shall have no further
      liability hereunder.

            

    

    

    1.5           This
Agreement may be altered or amended only with the written consent of all of the
parties hereto.  Should any of the Parties attempt to change this
Agreement in a manner, which, in the Escrow Agent’s discretion, shall be
undesirable, the Escrow Agent may resign as Escrow Agent by notifying the
Parties in writing five days in advance.  In the case of the Escrow
Agent’s resignation or removal pursuant to the foregoing, his only duty, until
receipt of notice from the Parties that a successor escrow agent has been
appointed, shall be to hold and preserve the Escrow Shares that are in his
possession.  Upon receipt by the Escrow Agent of said notice from the
Parties of the appointment of a successor escrow agent, the name of a successor
escrow account and a direction to transfer the Escrowed Shares, the Escrow Agent
shall promptly thereafter transfer all of the Escrowed Shares that it is still
holding in escrow, to said successor escrow agent.  Immediately after
said transfer of the Escrowed Shares, the Escrow Agent shall furnish the Parties
with proof of such transfer.  The Escrow Agent is authorized to
disregard any notices, requests, instructions or demands received by it from the
Parties after the Escrow Agent promptly transfers all of the Escrowed Shares
that it is still holding in escrow, to the above said successor escrow
agent.

    

    1.5   The
Escrow Agent shall be reimbursed by the Parties for any reasonable expenses
incurred in the event there is a conflict between the parties and the Escrow
Agent shall deem it necessary to retain counsel, upon whose advice the Escrow
Agent may rely. The Escrow Agent shall not be liable for any action taken or
omitted by him in good faith and in no event shall the Escrow Agent be liable or
responsible except for the Escrow Agent’s own gross negligence or willful
misconduct.  The Escrow Agent has made no representations or
warranties to the Parties in connection with this transaction. The Escrow Agent
has no liability hereunder to either party other than to hold the Escrowed
Shares and to deliver them under the terms hereof.  Each party hereto
agrees to indemnify and hold harmless the Escrow Agent from and with respect to
any suits, claims, actions or liabilities arising in any way out of this
transaction including the obligation to defend any legal action brought which in
any way arises out of or is related to this Agreement or the investment being
made by Purchaser. The Parties,
with the exception of the Company, acknowledge and represent that they are not
being represented in a legal capacity by Leser Hunter Taubman & Taubman and
have had the opportunity to consult with their own legal advisors prior to the
signing of this Agreement. The Parties, with the exception of the Company,
acknowledge that the Escrow Agent is not rendering securities advice to them
with respect to this transaction or otherwise.  The Parties consent to
the Escrow Agent acting in such capacity as legal counsel for the Company and
waive any claim that such representation represents a conflict of interest on
the part of the Escrow Agent.  The Parties understand that the Escrow
Agent and the Company are relying explicitly on the foregoing provisions
contained in this Section 1.5 in entering into this
Agreement.

    

    
      
         

      

      
        4

        
          

        

      

      
         

      

       

    

    1.6           The
Escrow Agent shall be obligated only for the performance of such duties as are
specifically set forth herein and may rely and shall be protected in relying or
refraining from acting on any instrument reasonably believed by the Escrow Agent
to be genuine and to have been signed or presented by the proper party or
parties.  The Escrow Agent shall not be personally liable for any act
the Escrow Agent may do or omit to do hereunder as the Escrow Agent while acting
in good faith, and any act done or omitted by the Escrow Agent pursuant to the
advice of the Escrow Agent's attorneys-at-law shall be conclusive evidence of
such good faith.

    

    1.7           The
Escrow Agent is hereby expressly authorized to disregard any and all warnings
given by any of the parties hereto or by any other person or corporation,
excepting only orders or process of courts of law and is hereby expressly
authorized to comply with and obey orders, judgments or decrees of any
court.  In case the Escrow Agent obeys or complies with any such
order, judgment or decree, the Escrow Agent shall not be liable to any of the
parties hereto or to any other person, firm or corporation by reason of such
decree being subsequently reversed, modified, annulled, set aside, vacated or
found to have been entered without jurisdiction.

    

    1.8           The
Escrow Agent shall not be liable in any respect on account of the identity,
authorities or rights of the parties executing or delivering or purporting to
execute or deliver the Agreement or any documents or papers deposited or called
for hereunder.

    

    1.9           If
the Escrow Agent reasonably requires other or further documents in connection
with this Agreement, the necessary parties hereto shall join in furnishing such
documents.

    

    1.10         It
is understood and agreed that should any dispute arise with respect to the
delivery and/or ownership or right of possession of the documents, the Escrowed
Shares held by the Escrow Agent hereunder, the Escrow Agent is authorized and
directed in the Escrow Agent's sole discretion (a) to retain in the Escrow
Agent's possession without liability to anyone all or any part of said
documents, the Escrowed Shares until such disputes shall have been settled
either by mutual written agreement of the parties concerned or by a final order,
decree or judgment of a court of competent jurisdiction after the time for
appeal has expired and no appeal has been perfected, but the Escrow Agent shall
be under no duty whatsoever to institute or defend any such proceedings or (b)
to deliver the Escrowed Shares and any other property and documents held by the
Escrow Agent hereunder to a state or federal court having competent subject
matter jurisdiction and located in the State of New York in accordance with the
applicable procedure therefor.

    

    
      
         

      

      
        5

        
          

        

      

      
         

      

    

     

    ARTICLE
2

    MISCELLANEOUS

    

    2.1           No
waiver of any breach of any covenant or provision herein contained shall be
deemed a waiver of any preceding or succeeding breach thereof, or of any other
covenant or provision herein contained.  No extension of time for
performance of any obligation or act shall be deemed any extension of the time
for performance of any other obligation or act.

    

    2.2           This
Agreement shall be binding upon and shall inure to the benefit of the permitted
successors and assigns of the parties hereto.

    

    2.3           This
Agreement is the final expression of, and contains the entire agreement between,
the parties with respect to the subject matter hereof and supersedes all prior
understandings with respect thereto.  This Agreement may not be
modified, changed, supplemented or terminated, nor may any obligations hereunder
be waived, except by written instrument signed by the parties to be charged or
by its agent duly authorized in writing or as otherwise expressly permitted
herein.

    

    2.4           Whenever
required by the context of this Agreement, the singular shall include the plural
and masculine shall include the feminine.  This Agreement may be
executed in two or more counterparts, all of which taken together shall
constitute one instrument.  Execution and delivery of this Agreement
by exchange of facsimile copies bearing the facsimile signature of a party shall
constitute a valid and binding execution and delivery of this Agreement by such
party.  Such facsimile copies shall constitute enforceable original
documents.

    

    2.5           The
parties hereto expressly agree that this Agreement shall be governed by,
interpreted under, and construed and enforced in accordance of the laws of the
State of New York. The parties agree that any dispute arising under or with
respect to or in connection with this Agreement, whether during the term of this
Agreement or at any subsequent time, shall be resolved fully and exclusively in
the federal or state courts resident in New York County, New York.

    

    2.6           Any
notice required or permitted hereunder shall be given in a manner provided in
the Notice Section contained in the Purchase Agreement to the address or contact
information for the Parties set forth therein or, in the case of notice to the
Escrow Agent, shall be sent by commercial overnight courier such as UPS or Fedex
to the Escrow Agent at the address first written above.

    

    2.7           By
signing this Agreement, the Escrow Agent becomes a party hereto only for the
purpose of this Agreement; the Escrow Agent does not become a party to the
Purchase Agreement or any related agreements.

    

    
      
         

      

      
        6

        
          

        

      

      
         

      

       

    

    2.8           Each
party acknowledges and agrees that this Agreement shall not be deemed prepared
or drafted by any one party.  In the event of any dispute between the
Parties concerning this Agreement, the Parties agree that any rule of
construction, to the effect that any ambiguity in the language of the Agreement
is to be resolved against the drafting party, shall not apply.

    

    2.9. If
the Management Team transfers any of the Escrowed Shares, the transferee shall
be required to execute and deliver a counterpart of this Agreement to the
Company, the Escrow Agent and the Investor Representative. Thereafter, such
transferee shall be deemed to be included in the Management
Team.  Notwithstanding the transfer of ownership of the Escrowed
Shares, all Escrowed Shares shall remain subject to this Agreement.

    

    (Signature
Page to Follow)

     

    
      
         

      

      
        7

        
          

        

      

      
         

      

    

     

    IN
WITNESS WHEREOF, the Parties hereto have executed this Agreement as of the date
first set forth above.

    

    Executed:

    
      

      
        
          
            
              	
                      TRESTLE
      HOLDINGS, INC.

                    
	 
      	 
      
	 
      	 
      
	
                      By:

                    	 
      
	
                      Name:

                    	
                      Eric
      Stoppenhagan

                    
	
                      Title:

                    	
                      Interim
      President

                    

            

          

        

      

      

      THE
MANAGEMENT TEAM

      

      
        
          
            
              
                	 
      
	
                        LAWRENCE
      CHEUNG

                      
	 
      
	 
      
	
                        BENJAMIN
      CHAN

                      

              

            

          

        

      

      

      MOQIZONE
HOLDINGS LIMITED

      (a Cayman
Islands corporation)

      

      
        
          
            
              
                	
                        By:

                      	 
      
	
                        Lawrence
      Cheung,

                      
	
                        President
      and CEO

                      

              

            

          

        

      

      

      
        
          
            
              	
                      Escrow
      Agent

                    
	 
      
	
                      Leser,
      Hunter, Taubman & Taubman

                    
	 
      
	 
      
	
                      Name:
      Louis Taubman

                    
	
                      Title:
      Partner

                    

            

          

        

      

    

    
      
         

      

      
        8

        
          

        

      

      
         

      

    

     

    INVESTOR
SIGNATURE PAGE:

    

    [PRINT
NAME OR NAME OF ENTITY]

     

    
      
        	
                X

              
	 
      	 
      
	
                By:

              	 
      
	 
      	 
      
	
                Name:

              	 
      
	 
      	 
      
	
                Title:

              	 
      

      

    

     

    
      
         

      

      
        9

        
          

        

      

      
         

      

    

     

    Exhibit
A

    

    
      	 
      	 
      	 
      
	
              Shareholder
      Name

            	 
      	
              Shares

            
	 
      	 
      	 
      
	 
      	 
      	 
      
	 
      	 
      	 
      
	 
      	 
      	 
      
	 
      	 
      	 
      
	 
      	 
      	 
      
	
              TOTAL

            	 
      	
              900
      Shares of Series B Preferred

              Stock
      or 900,000 shares of

              Common
      Stock

            

    

     

    
      
         

      

      
        10

        
          

        

      

      
         

      

    

    

    Exhibit
B

    

    Form
of Securities Purchase Agreement

     

    
      
         

      

      
        11

        
          

        

      

      
         

      

    

     

    Exhibit
C

    Form
of Share Exchange Agreement

     

    
      
         

      

      
        12

        
          

        

      

      
         

      

    

     

    Exhibit
D

    

    FORM OF ESCROW RELEASE
NOTICE

    

    Date:

    

    Leser,
Hunter, Taubman & Taubman

    17  State
Street, Floor 20

    New York,
New York 10004

    

    Dear
Escrow Agent:

    

    In
accordance with the terms of Article 1 of the Escrow Agreement dated as of May
[  ], 2009, (the “Escrow Agreement"), by and among TRESTLE HOLDINGS,
INC., a Delaware
corporation (the "Company"); MOQIZONE HOLDINGS
LIMITED, a Cayman Island
corporation ("MoqiZone
Cayman"); all the persons
listed on Schedule A hereto (the “Management
Team”); all of the
investors who signed the Purchase Agreement, as defined below (the “Investor
Group”) and the Investor Representative who has executed this Agreement on the
Investor Signature Page hereof (the “Investor Representative,” and
together with the Investor Group, the “Investors” and together with Trestle,
MoqiZone Cayman and the Management Team, the “Parties”); and your offices as
Escrow Agent, you are hereby notified of the following:

    

    
      	
               
      

            	
              1.

            	
              The
      Audit Date was ___________ __, 200__;
and

            

    

     

    
      	
               
      

            	
              2.

            	
              The
      Six Million Target Revenue or the Lower Target Revenue was/was not
      met.

            

    

     

    Accordingly,
please distribute the Escrowed Shares as follows:

     

    
      
        
          
            
              	
                      Recipient Name and

                      Address

                    	  	
                      Amount of Escrowed

                      Shares to be distributed

                    
	  	  	  
	 
      	 
      	 
      
	 
      	 
      	 
      
	 
      	 
      	 
      
	 
      	 
      	 
      
	 
      	 
      	 
      
	 
      	 
      	 
      

            

          

        

      

    

     

    
      
        
          
            
              
                
                  
                    
                      
                        
                          
                            
                              
                                
                                  	
                                          Very
      truly yours,

                                        
	 
      
	
                                          Trestle
      Holdings, Inc.

                                        
	
                                          By:

                                        	 	 
      
	
                                          Name:

                                        	 	 
      
	
                                          Title:

                                        	 	 
      
	 
      
	 
      
	
                                          (Investors
      Representative)

                                        
	 
      
	
                                          By:

                                        	 
      

                                

                              

                            

                          

                        

                      

                    

                  

                

              

            

          

        

      

    

     

    
      
         

      

      
        13

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