Michael Sinneck, who was recruited from IBM last year to head Microsoft's services unit, is leaving the software maker.
Sinneck was appointed in January 2002 to lead the services group, which includes Microsoft Consulting Services, Product Support Services and Premiere Services, as well as other services specifically for large customers, according to Microsoft's website.
As corporate vice-president of worldwide services, Sinneck also headed efforts to improve Microsoft's partner relationships, Microsoft said.
At IBM, where he worked for 32 years, his most recent role was as vice-president of business operations for IBM Global Services Americas.
Microsoft's chief information officer and vice-president of global operations and technology, Rick Devenuti, would add the services group to his responsibilities, Microsoft said.
Sinneck would move back to the East Coast to pursue opportunities outside of the company, Microsoft said.
He is one of several recent high profile departures and appointments at Microsoft.
Corporate vice president of its Information Worker Product Management Group, Joe Eschbach, announced he would leave Microsoft on December 1. He joined the company only a year ago from Adobe Systems.
Barbara Gordon, formerly vice president of the global sales organisation at Sun Microsystems, replaced Jonathan Murray as vice-president of global accounts.
Murray was named "national technology officer", a sales and evangelism role targeted at the European public sector.