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                                                                   EXHIBIT 10.97

                      AMENDMENT TO ASSET PURCHASE AGREEMENT

                  This AMENDMENT TO ASSET PURCHASE AGREEMENT ("Amendment") is
entered into as of December 3, 2001 by and among CoreExpress, Inc., a Delaware
corporation ("CoreExpress"), and Williams Communications, LLC, a Delaware
limited liability company ("Purchaser").

                                    RECITALS:

                  WHEREAS, reference is hereby made to that certain Asset
Purchase Agreement dated as of October 31, 2001 among CoreExpress and Purchaser
(the "Purchase Agreement"; capitalized terms used and not defined herein shall
have the meanings assigned to them in the Purchase Agreement, as amended
hereby); and

                  WHEREAS, CoreExpress and Purchaser have agreed to enter into
an amendment to the Purchase Agreement upon the terms and conditions contained
herein.

                  NOW, THEREFORE, in consideration of the premises contained
herein, and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto hereby agree as
follows:

1 Amendment to Section 1.4. Section 1.4 of the Purchase Agreement is hereby
amended by deleting the amount "Nineteen Million Five Hundred Thousand Dollars
($19,500,000)" which appears in the first sentence thereof and inserting the
amount "Eighteen Million Six Hundred Fifty-Nine Thousand Eighty-Four Dollars
($18,659,084)" in its place.

                  2. Amendment to Section 2.15. The Purchase Agreement is hereby
amended by adding the following as Section 2.15:

                           Section 2.15 Sycamore Equipment. Exhibit A to
                  Schedule 1.3 contains, in all material respects, a complete
                  list of the equipment manufactured and/or sold by Sycamore
                  Networks, Inc. to CoreExpress.

                  3. Amendment to Schedule 1.3. Schedule 1.3 to the Purchase
Agreement (Certain Excluded Capital Assets) is hereby amended by adding the
following as Item 12 in Section V of such Schedule:

                           12. Sycamore Networks, Inc. - All rights and assets
related to:

                                    a.   Purchase and License Agreement (Dated
                                         October 26, 2000) Amendment (Dated
                                         October 27, 2000)

                                    b.   Master Lease Agreement and Amendment
                                         (Included in Exhibit D of the Purchase
                                         and License Agreement)

                                    c.   Statement of Work

                                    d.   Evaluation/Demonstration Agreement;

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                                         including, but not limited to, the
                                         equipment set forth on Exhibit A
                                         attached hereto.

                  3. Miscellaneous.

                  3.1 Effect; Ratification. The amendments set forth herein are
         effective solely for the purposes set forth herein and shall be limited
         precisely as written, and shall not be deemed to be a consent to any
         amendment, waiver or modification of any other term or condition of the
         Purchase Agreement. Each reference in the Purchase Agreement to "this
         Agreement", "herein", "hereof" and words of like import shall mean the
         Purchase Agreement as amended hereby. This Amendment shall be construed
         in connection with and as part of the Purchase Agreement and all terms,
         conditions, representations, warranties, covenants and agreements set
         forth in the Purchase Agreement, except as herein amended or waived,
         are hereby ratified and confirmed and shall remain in full force and
         effect.

                  3.2 Counterparts. This Amendment may be executed in any number
         of counterparts, each such counterpart constituting an original but all
         together one and the same instrument.

                  3.3 Severability. In case any provision in or obligation under
         this Amendment shall be invalid, illegal or unenforceable in any
         jurisdiction, the validity, legality and enforceability of the
         remaining provisions or obligations, or of such provision or obligation
         in any other jurisdiction, shall not in any way be affected or impaired
         thereby.

                  3.4 GOVERNING LAW. THIS AMENDMENT AND THE RIGHTS AND
         OBLIGATIONS OF THE PARTIES HEREUNDER SHALL BE CONSTRUED IN ACCORDANCE
         WITH AND BE GOVERNED BY THE LAWS OF THE STATE OF ILLINOIS.

                  IN WITNESS WHEREOF, the parties hereto have executed this
Amendment as of the date first above written.

                                               COREEXPRESS, INC.

                                               By  /s/ JAMES A. WOOTTEN
                                                 -------------------------------
                                                 Title: President

                                               WILLIAMS COMMUNICATIONS, LLC

                                               By /s/ JAMES W. DUTTON
                                                 -------------------------------
                                                 Title: Vice President

                                       2<PAGE>

                                                                   EXHIBIT 10.98

                     FIRST AMENDMENT TO ASSET SALE AGREEMENT

                  This First Amendment (this "Amendment") is entered into as of
December 7, 2001, by and between iBEAM Broadcasting Corporation, a Delaware
corporation ("Seller"), and Williams Communications, LLC, a Delaware limited
liability company ("Purchaser"), amending the Asset Sale Agreement, dated as of
October 11, 2001 (the "Agreement"), by and between Seller and Purchaser.

                                   WITNESSETH

                  WHEREAS, in accordance with Section 9.3 of the Agreement, the
parties hereto desire to amend the Agreement to reflect, among other things,
certain approvals of the Bankruptcy Court, granted by virtue of the order
entered by the Honorable Erwin I. Katz on November 1, 2001;

                  NOW, THEREFORE, in consideration of the mutual agreements
herein contained and intending to be legally bound hereby, the parties hereto
agree as follows:

                  Section 1. Definitions. Unless otherwise indicated,
capitalized terms used herein but not otherwise defined herein shall have the
respective meanings set forth in the Agreement.

                  Section 2. Amendments to the Agreement. The Agreement is
hereby amended as follows:

                  (a) Section 1.1 of the Agreement is hereby amended by deleting
the words "or any of its Subsidiaries" from the definition of "Assets".

                  (b) Schedule 2.2 of the Agreement is hereby amended and
restated in its entirety and is replaced with "Amended Schedule 2.2" attached
hereto as Exhibit A.

                  (c) Section 4.9(a) of the Disclosure Letter of the Agreement
is hereby amended and restated in its entirety and is replaced with "Amended
Section 4.9(a)" attached hereto as Exhibit B.

                  (d) Section 6.7 of the Agreement is hereby amended by
inserting the following sentence immediately after the second sentence of the
lead-in paragraph of Section 6.7: "Unless the parties hereto agree otherwise and
the Bankruptcy Court

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approves such other agreement, the Sale Hearing shall be held at Courtroom 2B,
U.S. Courthouse, 844 King Street, Wilmington, Delaware 19801, on November 28,
2001, at 10:00 a.m. (EST), or as soon thereafter as counsel can be heard."

                  (e) Section 6.7(a) of the Agreement is hereby amended and
restated in its entirety as follows:

                           (a) Alternative Bid Deadline. All Alternative Bids
must be submitted not later that 3:00 p.m. (EST) on November 26, 2001 (the
"Alternative Bid Deadline"), to:

                           Peter Desnoes
                           Chairman, President and CEO
                           iBEAM Broadcasting Corporation
                           645 Almanor Avenue, Suite 100
                           Sunnyvale, CA 94085
                           Facsimile No. 408-730-5569

                           with copies to:

                           G. Larry Engel, Esq.
                           Brobeck, Phleger & Harrison
                           Spear Street Tower
                           One Market
                           San Francisco, CA 94105
                           Facsimile No. 415-442-1010

                           and:

                           David M. Fournier, Esq.
                           Pepper Hamilton LLP
                           1201 Market Street, Suite 1600
                           Wilmington , DE 19801
                           Facsimile No. 302-656-8865

                                    Seller shall immediately distribute a copy
of each such Alternative Bid received to counsel for Purchaser."

                                       2

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                  (f) Section 6.7(b) of the Agreement is hereby amended by
deleting the words "Except as otherwise provided in the Bidding Procedures
Order," from the second sentence of Section 6.7(b).

                  (g) Section 6.7(b)(ii)(z) of the Agreement is hereby amended
and restated in its entirety as follows: "(z) in the case of the initial
Qualified Alternative Bid, $500,000, and in the case of any subsequent Qualified
Alternative Bids, $250,000 (or in the case of the first SUCH Subsequent Bid by
Purchaser, $500,000) over the immediately preceding Qualified Alternative Bid;".

                  (h) Section 6.7(c)(i) of the Agreement is hereby amended by
(i) deleting the words "Brobeck, Phleger, and Harrison on the Business Day
immediately prior to the Sale Hearing, beginning at 11:00 a.m. (PST)" in the
first sentence of Section 6.7(c)(i) and replacing those deleted words with the
words "Pepper Hamilton LLP, 1201 Market Street, Suite 1600, Wilmington, Delaware
19801, on November 27, 2001, beginning at 2:00 p.m. (EST)"; and (ii) inserting
in the fourth sentence of Section 6.7(c)(i), the words "it determines"
immediately after the words "additional procedural rules that" and immediately
prior to the words "are reasonable".

                  (i) Section 6.7(c)(ii) of the Agreement is hereby amended by
inserting in the first sentence of Section 6.7(c)(ii) the words "(subject to the
provisions of Section 6.7(b)(ii))" immediately after the words "in minimum
increments" and immediately prior to the words "of at least".

                  (j) Section 6.7(c)(iv) of the Agreement is hereby amended by
deleting the words "At least one Business Day prior to the Auction" in the first
sentence of Section 6.7(c)(iv) and replacing those deleted words with the words
"Not later than 9:00 a.m. (EST) on the day of the Auction".

                  (k) A new Section 6.7(c)(v) is hereby inserted into the
Agreement and shall be as follows:

                           "Seller, in consultation with its legal and financial
professionals, shall determine in its sole discretion whether an Alternative Bid
meets the qualifications described herein and in the Bidding Procedures Order
and whether a Qualified Alternative Bid or Subsequent Bid constitutes the
highest and/or best offer for the Acquired Assets. The highest and/or best offer
as determined by Seller shall be submitted to the Bankruptcy Court for approval
at the Sale Hearing."

                                       3

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                  (l) The provisions of Section 6.7(d) of the Agreement are
hereby deleted in their entirety and Section 6.7(d) shall be as follows: "(d)
[intentionally left blank]".

                  (m) Section 6.7(e) of the Agreement is hereby amended by
deleting the reference to "$750,000" in the first sentence of Section 6.7(e) and
replacing such reference with "$500,000".

                  (n) Section 7.2(c) of the Agreement is hereby amended by
inserting the words "or another authorized executive officer of Purchaser"
immediately following the words "or President of Purchaser".

                  Section 3. Effect. Except as amended hereby, the Agreement
shall remain in full force and effect in all respects.

                           [Signature page to follow]

                                       4

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                  IN WITNESS WHEREOF, the parties hereto have caused this
Amendment to be executed as of the date first above written.

                                            iBEAM BROADCASTING CORPORATION

                                            By:       /s/ RANDALL K. GAUSMAN
                                               ---------------------------------
                                               Name:  Randall K. Gausman
                                               Title: CFO

                                            WILLIAMS COMMUNICATIONS, LLC

                                            By:     /s/ JOHN C. BUMGARNER
                                               ---------------------------------
                                               Name:  John C. Bumgarner
                                               Title: Senior Vice President

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