C#, MSSQL, etc?
Lots companies, in non-tech fields
Mainly companies with smaller de-emphasized engineering organizations.
Woot
Any startup's that use Azure stack?
Valve/Steam. Visual Studio C++ , window servers and sql server. Window
Docusign
Ingenio. Haha.
Zocdoc, Morgan Stanley, Perkin Elmer
Pick your favorite non tech company and they probably use MS stack.
Stackoverflow