Microsoft is an unusual company for the sheer number of product lines that bring in more than a billion dollars. While the company doesn't break out revenues for all of its product lines, Communications Director Frank Shaw famously revealed Microsoft's billion-dollar businesses to the TechFlash news blog last year. Under those businesses, of course, are Microsoft's most important product lines. Microsoft has its hands in many areas -- here's the 13 most important products to keep an eye on in 2012.
1. Windows
2. Office
3. Exchange
4. SharePoint
5. SQL Server
6. Windows Server
7. Visual Studio
8. Xbox
9. Bing
10. Dynamics
11. System Center
12. Skype
13. Windows Azure
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