Source code for older Visual Studio projects cannot be managed by opening them in Team Foundation. Doing so would require them to upgrade to the current version of Visual Studio 2008. However, you can use Source Control Explorer, or the command line to manage the source code. Using either of these methods, you can continue to develop and build code in your older Visual Studio or non-Visual Studio program while using Team Foundation version control to manage the source files.
Using Source Control Explorer
Source Control Explorer displays all of the folders and files on the server. You can create a workspace and working folders for any kind of project and use Source Control Explorer to manage them. For more information, see Using Source Control Explorer. If you use Source Control Explorer, you must run Team Explorer side-by-side with the older or non-Visual Studio program.
Using the Command Line
You can use the Team Foundation command-line tool to add and manage older or non-Visual Studio projects in source control. If you use the command-line tool to manage source code, you can write and build code in your older or non-Visual Studio program while checking files in and out from the command line. For more information on using the Team Foundation command line tool, see Team Foundation Version Control Command-Line Reference.