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Check out these free eBooks on Microsoft Virtual Academy. Microsoft System Center: Building a Virtualized Network Solution Mitch Tulloch with Nigel Cain, Alvin Morales, Michel Luescher, Damian Flynn February 2014.
Microsoft has several products that are generating good revenue for their business. Mary Jo Foley recently published this article that has more details. Most of the heavy hitters are big.
If you are a developer you might be interested in a free Visual Studio 2008 clinic from Microsoft. This clinic will provide a start point for Enterprise Developers and Software.