MSN Adcenter Open to all Now

Adcenter launched yesterday (May 4th)

"Microsoft today is launching its adCenter online advertising system in the U.S., and will now compete directly with Google and Yahoo! in selling ads on the Web.

The official announcement is coming this morning when Chief Executive Steve Ballmer addresses the company's Strategic Account Summit, a wide-ranging two-day event that on Wednesday included an unusual onstage interview of Chairman Bill Gates that touched on his private and professional life."

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