Microsoft's 7 Mobile Operating Systems

Adding this all up, Microsoft has several mobile OS products in various stages of production, including

Windows Mobile 6.5

Windows Phone 7

KIN

Windows Embedded Handheld

Windows Embedded Handheld 7

Windows Embedded Standard 7

Windows Embedded Compact 7.

As ZD blogger Mary Jo Foley noted recently, this fact is somewhat amusing in the wake of Microsoft CEO Steve Ballmer's criticism of Google for having two different mobile OSes (Chrome OS and Android.)

via Microsoft's Mobile Strategy Isn't A Strategy. It's A Mess.

That's not version 7 of an OS, that's 7 different OS's in the market at the same time.