Microsoft have been trying to get out of this for quite some time. Back when I worked for a very large revolving credit transactions processor, the stated goal was to get into the online payments game (this nearly 20 years ago now). Microsoft Passport was among the products aimed at this effort, which ultimately failed, attributed by many at the time with the lack of trust any other business had at getting in bed with Microsoft standing on their revenue stream.
Windows (which also, up until now, included Surface, which contributed $853 million to the total in fiscal 2013)
Windows Server
Windows Azure
Office (client)
Xbox
SQL Server
System Center (client and server both, so includes Windows Intune)
SharePoint
Visual Studio
Dynamics (CRM and ERP)
Online Advertising (search and display both) Office 365
Client-access license (CAL) suites (formerly known as desktop access)
Enterprise Services (including consulting)
Enterprise communication business (Exchange plus Lync)
[http://www.zdnet.com/article/microsofts-16-billion-dollar-bu...]
Not too bad, eh?