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Re:Rejuvenating the Microsoft C/C++ Compiler by pjmlp on Friday September 25, 2015 @11:49AM (#10278806)
They didn't mentioned on the interview.

If I recall correctly it was at a Visual Studio event last year, on those floor interviews they publish with the teams on C9.

Re:Rejuvenating the Microsoft C/C++ Compiler by cwyers on Friday September 25, 2015 @11:57AM (#10278862)
Adobe is almost certainly one:

https://helpx.adobe.com/creative-suite/kb/microsoft-visual-c...

There's probably quite a few internal-only users of Visual C++ too.

EDIT: Well, they're a high-profile user of Visual C++, I have no idea if they require C99 support but they ship a Mac version so it's possible.