The headquarters of Yahoo Inc. is pictured in Sunnyvale, California, May 5, 2008. WASHINGTON, Sept 11 (Reuters) – U.S. antitrust regulators have requested more documents in their probe of Microsoft Corp’s deal to provide search engine technology to rival Yahoo Inc, the two companies said on Friday.  Microsoft and Yahoo confirmed that the Justice Department’s antitrust division had made a second request for documents, which indicates a decision to conduct a deeper review that could take months.

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