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<PAGE> EXHIBIT 23.1 CONSENT OF ERNST & YOUNG, INDEPENDENT AUDITORS We consent to the incorporation by reference in the Registration Statement (Form S-8) of our report dated January 21, 2000, with respect to the consolidated financial statements and financial statement schedule of Commerce One, Inc. included in its Annual Report (Form 10-K) for the year ended December 31, 1999, filed with the Securities and Exchange Commission. /s/ ERNST & YOUNG LLP Walnut Creek, California September 19, 2000
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