Document:

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                                                                 EXHIBIT 10.15.4
                                LIMITED WAIVER TO
                                CREDIT AGREEMENT

         This Limited Waiver to Credit Agreement (this "Limited Waiver"), dated
as of December 31, 2005, is made by and among, on the one hand, WELLS FARGO
FOOTHILL, INC., a California corporation ("Lender"), and on the other hand,
EASYLINK SERVICES CORPORATION, a Delaware corporation ("Parent"), and each of
Parent's Subsidiaries identified on the signature pages hereof (such
Subsidiaries, together with Parent, are referred to hereinafter each
individually as a "Borrower", and individually and collectively, jointly and
severally, as the "Borrowers").

                                    RECITALS

         A. The Borrowers and the Lender are parties to that certain Credit
Agreement, dated as of December 9, 2004 (as amended, and as the same may be
further amended, modified or restated from time to time, the "Credit
Agreement").

         B. The Borrowers have requested a limited one-time waiver to the
Borrowers' non-compliance with the EBITDA covenant and Projection delivery, each
under the Credit Agreement as provided herein.

         C. The Lender is willing to waive such non-compliance, subject to the
terms and conditions of this Limited Waiver.

         NOW, THEREFORE, in consideration of the premises herein contained, and
for other good and valuable consideration (the receipt, sufficiency and adequacy
of which are hereby acknowledged), the parties hereto (intending to be legally
bound) hereby agree as follows:

            1. Definitions. Terms capitalized herein and not otherwise defined
herein shall have the meanings ascribed to such terms in the Credit Agreement.

            2. Limited Waivers. Subject to the terms and conditions contained
herein, the Lender hereby waives the Borrowers' obligation to comply with (i)
the covenant contained in Section 6.16(a) (Minimum EBITDA) thereof solely for
the period ended December 31, 2005 and (ii) the financial reporting covenant
contained in Schedule 5.3(e) to the Credit Agreement (Parent's Projections)
thereof solely for the period ended December 31, 2005 (the "Projections
Waiver"). The Borrowers hereby agree to deliver to the Lender the Parent's
Projections in accord with Schedule 5.3(e) to the Credit Agreement on or prior
to January 16, 2006. If the Borrowers fail to deliver to the Lender such
Parent's Projections on or prior to January 16, 2006, then the Lender may pursue
any and all remedies available to it under the Credit Agreement in connection
with occurrence and continuance of the Event of Default arising under the Credit
Agreement from the failure of the Borrowers to deliver to the Lender the
Parent's Projections. The Borrowers and the Lender hereby agree that concurrent
with delivery of the Parent's Projections, the Minimum EBITDA covenant contained
in Section 6.16(a)(i) of the Credit Agreement shall be amended to such amounts
as agreed to by the Borrowers and the Lender utilizing the Parent's Projections.
In the event that the Borrowers and Lender fail to agree on such amended amounts
for the Minimum EBITDA covenant, then the Minimum EBITDA covenant shall remain
the same amounts as provided in Section 6.16(a)(i) of the Credit Agreement for
the three-month period ending March 31, 2006, and for each calendar quarter
thereafter. The Borrowers further agree that during the period commencing on the
date hereof and continuing until the Minimum EBITDA covenant is conclusively
determined in accordance with the terms hereof, the Borrowers shall maintain,
during such period, an amount of Qualified Cash (as defined in the Credit
Agreement) in an amount equal to not less than $4,000,000 (the "Qualified Cash
Covenant"). If the Borrowers fail to maintain the Qualified Cash Covenant in
accordance with the terms of this Limited Waiver, then the Lender may pursue any
and all remedies available to it under the Credit Agreement in connection with
occurrence and continuance of the Event of Default arising under the Credit
Agreement (as modified by this Limited Waiver) from the failure of the Borrowers
to maintain the Qualified Cash Covenant.

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         3. Conditions. The limited waivers contained in Section 2 above are
subject to, and contingent upon, the prior or contemporaneous satisfaction of
each of the following conditions:

              (i) The Borrowers and the Lender shall have executed and delivered
         to each other this Limited Waiver.

              (ii) The Borrowers shall have paid to the Lender a fully earned,
         non-refundable waiver fee in the amount of $50,000. The Borrowers
         hereby agree to permit the Lender to actually receive such fee as of
         January 15, 2006.

         4. Reference to and Effect on the Credit Agreement. Except as expressly
provided herein, the Credit Agreement and all of the Loan Documents shall remain
unmodified and continue in full force and effect and are hereby ratified and
confirmed. Except as expressly provided in this Limited Waiver, the execution,
delivery and effectiveness of this Limited Waiver shall not operate as a waiver
of: (i) any right, power or remedy of the Lender under the Credit Agreement or
any of the Loan Documents, or (ii) any Default or Event of Default under the
Credit Agreement.

         5. Costs, Expenses and Taxes. Without limiting the obligation of the
Borrowers to reimburse the Lender for costs, fees, disbursements and expenses
incurred by the Lender as specified in the Credit Agreement, the Borrowers agree
to pay on demand all reasonable costs, fees, disbursements and expenses of the
Lender in connection with the preparation, execution and delivery of this
Limited Waiver and the other agreements, instruments and documents contemplated
hereby, including, without limitation, reasonable attorneys' fees and
out-of-pocket expenses.

         6. Counterparts; Facsimile. This Limited Waiver may be executed in one
or more counterparts, each of which taken together shall constitute one and the
same instrument. Delivery of an executed counterpart of this Limited Waiver by
telefacsimile shall be equally as effective as delivery of a manually executed
counterpart of this Limited Waiver. Any party delivering an executed counterpart
of this Limited Waiver by telefacsimile shall also deliver a manually executed
counterpart of this Limited Waiver, but the failure to deliver a manually
executed counterpart shall not affect the validity, enforceability or binding
effect of this Limited Waiver.

                                       2
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         7. GOVERNING LAW. THIS LIMITED WAIVER SHALL BE CONSTRUED IN ALL
RESPECTS IN ACCORDANCE WITH, AND ENFORCED AND GOVERNED BY, THE INTERNAL LAWS OF
THE STATE OF NEW YORK, WITHOUT REGARD TO CONFLICTS OF LAW PRINCIPLES.

         8. JURY TRIAL. THE BORROWERS AND THE LENDER HEREBY IRREVOCABLY AND
KNOWINGLY WAIVE (TO THE FULLEST EXTENT PERMITTED BY LAW) ANY RIGHT TO A TRIAL BY
JURY IN ANY ACTION OR PROCEEDING (INCLUDING, WITHOUT LIMITATION, ANY
COUNTERCLAIM) ARISING OUT OF THIS LIMITED WAIVER. EACH OF THE LENDER AND THE
BORROWERS AGREE THAT ANY SUCH ACTION OR PROCEEDING SHALL BE TRIED BEFORE A COURT
AND NOT A JURY.

                            [SIGNATURE PAGE FOLLOWS]

                                       3
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         IN WITNESS WHEREOF, the undersigned have caused this Limited Waiver to
Credit Agreement to be duly executed and delivered as of the date first above
written.

                              EASYLINK SERVICES CORPORATION,
                              a Delaware corporation

                              By:      /s/Michael A. Doyle
                                       --------------------
                              Title:   Vice President, Chief Financial Officer

                              EASYLINK SERVICES USA, INC.,
                              a Delaware corporation

                              By:      /s/Michael A. Doyle
                                       --------------------
                              Title:   Vice President, Chief Financial Officer

                              WELLS FARGO FOOTHILL, INC.,
                              a California corporation

                             By:       /s/ Ronald R. Cote
                                       ------------------
                             Title:    V.P.<PAGE>

EXHIBIT 10.15.12

                               AMENDMENT NO. 1 TO
                                PLEDGE AGREEMENT

         This Amendment No. 1 to Pledge Agreement (this "AMENDMENT"), dated as
of July 29, 2005, is made by EASYLINK SERVICES USA, INC., a Delaware corporation
(the "PLEDGOR"), and WELLS FARGO FOOTHILL, INC., a California corporation
(the"PLEDGEE").

                                 R E C I T A L S

         A. The Pledgor and the Pledgee are parties to that certain Pledge
Agreement dated as of December 9, 2004 (the "ORIGINAL PLEDGE AGREEMENT").

         B. The parties hereto desire to amend certain of the terms and
provisions of the Original Pledge Agreement (as the Original Pledge Agreement is
amended by this Amendment, and as the Original Pledge Agreement may be further
amended, modified or restated from time, collectively the "PLEDGE AGREEMENT") as
provided herein.

         NOW, THEREFORE, in consideration of the premises herein contained, and
for other good and valuable consideration (the receipt, sufficiency and adequacy
of which are hereby acknowledged), the parties hereto (intending to be legally
bound) hereby agree as follows:

            1. Definitions. Terms capitalized herein and not otherwise defined
herein shall have the meanings ascribed to such terms in the Pledge Agreement.

            2. Amendment to Original Pledge Agreement. Subject to the terms and
conditions contained herein, the parties hereto hereby amend the Original Pledge
Agreement as follows:

         Annex A attached to the Original Pledge Agreement is hereby deleted in
         its entirety and replaced and amended and restated with Annex A
         attached to this Amendment as Exhibit A.

            3. Conditions Precedent. The amendment contained in Section 2 above
is subject to, and contingent upon, the prior or contemporaneous satisfaction of
each of the following conditions precedent, each in form and substance
satisfactory to the Pledgee:

                  (i) The Pledgor and the Pledgee shall have executed and
            delivered to each other this Amendment; and

                  (ii) The Pledgor shall have delivered to the Pledgee the
            Pledged Collateral together with stock powers executed in blank.

            4. Reference to and Effect on the Pledge Agreement. Except as
expressly provided herein, the Pledge Agreement shall remain unmodified and
continue in full force and effect and is hereby ratified and confirmed. The
execution, delivery and effectiveness of this Amendment shall not operate as a
waiver of: (i) any right, power or remedy of the Pledgee under the Pledge
Agreement, or (ii) any Default or Event of Default under the Pledge Agreement.

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            5. Representations and Warranties of the Pledgor. The Pledgor hereby
represents and warrants to the Pledgee, which representations and warranties
shall survive the execution and delivery of this Amendment, that on and as of
the date hereof and after giving effect to this Amendment:

            (a) The Pledged Interests and the Pledged Collateral described in
         Annex A attached hereto is, and all other Pledged Collateral in which
         the Pledgor shall hereafter grant a lien or security interest pursuant
         to Section 3 of the Pledge Agreement will be, duly authorized, validly
         issued, and fully paid, and, none of such Pledged Collateral is or will
         be subject to any legal or contractual restriction. The Pledged
         Collateral is, as of the date hereof, and shall be at all times
         hereafter during the term of the Pledge Agreement, freely transferable
         without restriction or limitation (except as limited by the terms of
         the Pledge Agreement).

            (b) The Pledged Interests and the Pledged Collateral described in
         Annex A hereto constitutes all of the issued and outstanding securities
         and investment property legally and beneficially owned by the Pledgor
         on the date hereof in or relating to Issuers.

            (c) The representations and warranties of the Pledgor set forth in
         the Pledge Agreement is true, correct and complete on and as of the
         date hereof; provided, that the references to the Pledge Agreement
         therein shall be deemed to include the Pledge Agreement as amended by
         this Amendment.

            (d) The Pledgor acknowledges that the Pledgee is specifically
         relying upon the representations, warranties and agreements contained
         in this Amendment and that such representations, warranties and
         agreements constitute a material inducement to the Pledgee in entering
         into this Amendment.

            6. Successors and Assigns; Amendment. This Amendment shall be
binding upon and inure to the benefit of the parties hereto and their respective
successors and assigns; provided, however, Pledgor may not assign this Amendment
or any of its rights hereunder without the Pledgee's prior written consent. Any
prohibited assignment of this Amendment shall be absolutely null and void. This
Amendment may only be amended or modified by a writing signed by the Pledgee and
the Pledgor.

            7. Severability; Construction. Wherever possible, each provision of
this Amendment shall be interpreted in such a manner so as to be effective and
valid under applicable law, but if any provision of this Amendment is held to be
prohibited by or invalid under applicable law, such provision or provisions
shall be ineffective only to the extent of such provision and invalidity,
without invalidating the remainder of this Amendment. Neither this Amendment nor
any uncertainty or ambiguity herein shall be construed or resolved against
Pledgee, whether under any rule of construction or otherwise. On the contrary,
this Amendment has been reviewed by all parties hereto and shall be construed
and interpreted according to the ordinary meaning of the words used so as to
fairly accomplish the purposes and intentions of the parties hereto.

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            8. Counterparts; Facsimile. This Amendment may be executed in one or
more counterparts, each of which taken together shall constitute one and the
same instrument. Delivery of an executed counterpart of this Amendment by
telefacsimile shall be equally as effective as delivery of a manually executed
counterpart of this Amendment. Any party delivering an executed counterpart of
this Amendment by telefacsimile shall also deliver a manually executed
counterpart of this Amendment, but the failure to deliver a manually executed
counterpart shall not affect the validity, enforceability or binding effect of
this Amendment.

            9. CHOICE OF LAW AND VENUE; JURY TRIAL WAIVER.

               (a) THE VALIDITY OF THIS AMENDMENT, THE CONSTRUCTION,
            INTERPRETATION, AND ENFORCEMENT HEREOF, AND THE RIGHTS OF THE
            PARTIES HERETO WITH RESPECT TO ALL MATTERS ARISING HEREUNDER OR
            RELATED HERETO SHALL BE DETERMINED UNDER, GOVERNED BY, AND CONSTRUED
            IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

               (b) THE PARTIES AGREE THAT ALL ACTIONS OR PROCEEDINGS ARISING IN
            CONNECTION WITH THIS AMENDMENT SHALL BE TRIED AND LITIGATED ONLY IN
            THE STATE AND FEDERAL COURTS LOCATED IN THE COUNTY OF NEW YORK,
            STATE OF NEW YORK, PROVIDED, HOWEVER, THAT ANY SUIT SEEKING
            ENFORCEMENT AGAINST ANY PLEDGED COLLATERAL OR OTHER PROPERTY MAY BE
            BROUGHT, AT PLEDGEE'S OPTION, IN THE COURTS OF ANY JURISDICTION
            WHERE AGENT ELECTS TO BRING SUCH ACTION OR WHERE THE PLEDGED
            COLLATERAL OR OTHER PROPERTY MAY BE FOUND. PLEDGOR AND PLEDGEE
            WAIVE, TO THE EXTENT PERMITTED UNDER APPLICABLE LAW, ANY RIGHT EACH
            MAY HAVE TO ASSERT THE DOCTRINE OF FORUM NON CONVENIENS OR TO OBJECT
            TO VENUE TO THE EXTENT ANY PROCEEDING IS BROUGHT IN ACCORDANCE WITH
            THIS SECTION 9(b).

               (c) PLEDGOR AND PLEDGEE HEREBY WAIVE THEIR RESPECTIVE RIGHTS TO A
            JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING OUT
            OF THIS AMENDMENT OR ANY OF THE TRANSACTIONS CONTEMPLATED HEREIN,
            INCLUDING CONTRACT CLAIMS, TORT CLAIMS, BREACH OF DUTY CLAIMS, AND
            ALL OTHER COMMON LAW OR STATUTORY CLAIMS. PLEDGOR AND PLEDGEE
            REPRESENT THAT EACH HAS REVIEWED THIS WAIVER AND EACH KNOWINGLY AND
            VOLUNTARILY WAIVES ITS JURY TRIAL RIGHTS FOLLOWING CONSULTATION WITH
            LEGAL COUNSEL. IN THE EVENT OF LITIGATION, A COPY OF THIS AMENDMENT
            MAY BE FILED AS A WRITTEN CONSENT TO A TRIAL BY THE COURT.

<PAGE>

        IN WITNESS WHEREOF, the undersigned have caused this Amendment to be
duly executed and delivered as of the date first above written.

                                EASYLINK SERVICES USA, INC.

                                By:   /s/Michael A. Doyle
                                      -------------------
                                Its:  Vice President and Chief Financial Officer

                                WELLS FARGO FOOTHILL, INC.

                                By:  /s/Ronald A. Cote
                                     -----------------
                                Its: V.P.

ACKNOWLEDGED AND AGREED:
-----------------------

         The undersigned hereby (i) acknowledges the pledge of the Pledged
Collateral described above pursuant to the terms of the Original Pledge
Agreement, as amended by this Amendment and agrees to register such pledge in
its books and records, and (ii) agrees, upon receipt of notice from the Pledgee
of the occurrence and during the continuance of an Event of Default, to comply
with the written instructions originated by the Pledgee, without further consent
of the registered holder of the Pledged Collateral, including, without
limitation, instructions to pay and remit to the Pledgee all distributions and
other amounts payable to the Pledgor (upon redemption, termination and
dissolution of the undersigned or otherwise in respect of the Pledged
Interests), and to transfer to, and register the Pledged Collateral in the name
of, the Pledgee or its nominee, and (iii) agrees to promptly honor its payment
obligations contained in the Original Pledge Agreement, as amended by this
Amendment including pursuant to Sections 10 and 19 of the Original Pledge
Agreement, as amended by this Amendment

                                QUICKSTREAM SOFTWARE, INC.

                                By:   /s/Michael A. Doyle
                                      -------------------
                                Its:  Vice President and Chief Financial Officer

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