Microsoft Bans Ex-Windows Chief From Working At 7 Rival Vendors

Form 10-K

Sinofsky, who left Microsoft last November after 23 years with the company, can't "accept direct or indirect employment" with Amazon, Apple, EMC, Facebook, Google, Oracle or VMware until Dec. 31, 2013, one year from the date of his official departure, Microsoft said in the 10-K.

The list of companies was first spotted by GigaOM Tuesday.

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What's ironic about Sinofsky's non-compete is that he himself was notorious for being obsessed with secrecy, especially during Windows 8 development. At last year's Build conference, Microsoft's field evangelists weren't allowed to talk to attendees about Windows 8, one Microsoft partner told CRN last November.

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Most companies listed in the 10-K are obvious Microsoft rivals -- especially Google and VMware, which also are barred from attending Microsoft's annual Worldwide Partner Conference. is also banned from WPC, but isn't part of the list.

It's harder to see why Microsoft would be concerned about Sinofsky jumping to Facebook, since Microsoft bought a 1.6 percent stake in the social network in 2007 for $240 million. Microsoft, however, did pay $1.2 billion last June to acquire Yammer, which has been described as a business-friendlier version of Facebook.

Oracle is a longtime Microsoft enterprise software rival, but the companies just unveiled a big cloud computing deal and are apparently on friendlier terms than in the past.

Microsoft first mentioned Sinofsky's non-compete agreement in an SEC filing last month, but didn't name the banned vendors.

In the filing, Microsoft said it awarded Sinofsky 418,361 shares, worth some $14.2 million, in return for complying with the terms of the retirement agreement.