Visual Studio Team Services Connect any version of Visual Studio to Visual Studio Team Services or Team Foundation Server. Visual Studio has been around for a long time and there are still people developing in Visual Basic 6 or Visual Studio 2008. Even if you're using a more recent IDE, you could need one or more hotfixes and/or service packs.
Team Foundation Server Install Team Foundation Server Power Tools side-by-side You might be connecting to multiple versions of TFS and use multiple versions of Visual Studio. Which Power tools work with which?