Microsoft Visual Source Safe - Microsoft In-house Use

Microsoft In-house Use

Although "eating their own dog food" is often said to be part of Microsoft's culture, VSS appears to be an exception; it is widely rumored that very few projects within Microsoft rely on VSS, and that the predominant tool is SourceDepot. According to Matthew Doar

Microsoft itself used an internally developed version of RCS named SLM until 1999, when it began using a version of Perforce named SourceDepot.

The Microsoft Developer Division is now using the new Team Foundation Server for most of its internal projects, although a VSS transcript implied that other large teams use "a mix of customized in-house tools."