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I read somewhere(?) that they where running Perforce with some internal tooling built on top of it.

I saw/heard that as well (hopefully someone can come up with the link). Things like Windows/Office apparently are in a custom perforce.

I believe that they do use TFS on a lot of the internal projects though and that Visual Studio is now done in TFS.

Here is a link about TFS use inside Microsoft: http://blogs.msdn.com/b/visualstudioalm/archive/2013/08/20/t...

Apparently they use several large TFS instances.

The following is a presentation in 2008 by Richard Erwin of Microsoft at the BCS CMSG (Configuration Management Specialist Group):

http://bcs-cmsg.org.uk/events/e20081124/2008-11-24-agile-scm...

Lots of good stuff there, but a key one is slide 8. In the question session Richard confirmed that Source Depot (the custom version of Perforce) was at that time still used for the source management although TFS was used for bug tracking etc for Office and Windows.

Don't know what has happened in the intervening years...

This is correct.

http://programmers.stackexchange.com/a/85891

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