Before migration from VSS to TFS you have to know the following :
1- The Differences between VSS & TFS.
2- TFS provides a command line Tool to run the VSS Converter to migrate VSS Project to TFS.
**There's a GUI VSS Converter tool provided but wasn't tested by Microsfot.
3- Features available in VSS and not availbe in TFS.
4- Common Migration Bitfalls (Labels Problem, History,VS Binding).
5- Don't neglect the planning and prepariotn phase before running the VSS Converter.
6- Read Team Foundation Server Administrator Guide.
Enjoy with TFS :)
Moustafa arafa @ London -Hethro Airport