Windows Server takes most of the profit in the web server market. SQL Server does very well even with PostgreSQL and MySQL being given away for free. They compete with free as in beer offerings and keep making a ton of money.

Here's a list of 16 billion dollar businesses for Microsoft[1]:

Windows

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)

That list is from 2013 so I now think their phone business and the Surface business either reached or are close to a billion in revenue each. And all of them are increasing in revenue by a lot, except for maybe Windows client.

Why do they care too much if Linux is on a billion routers or super computers? This is like iPhone vs. Android. Android may be on a billion phones, but Apple is printing money with iPhones.

But yeah Microsoft has been "dying" from the 2000s, if you believe Slashdot posts, and the Year of the Linux Desktop(TM) is really right around the corner this time.

[1] http://www.zdnet.com/article/microsofts-16-billion-dollar-bu...