5. The enterprise still runs on Windows Server
Microsoft's server ecosystem remains a fixture in corporate data centers. At the center of it all is Windows Server, which, with Version 2012, keeps getting stronger and more innovative. Microsoft Exchange long ago won the corporate email battle and isn't in danger of losing its crown any time soon. In fact, Microsoft hopes to ride Exchange's success to the cloud.
SharePoint, meanwhile, has lost steam as it has evolved from a straightforward departmental solution to an overly complex IT implementation, but it remains at home in thousands of corporate data centers and branch offices. That doesn't even address the legions of custom corporate Windows applications still powering many companies.