VSS Upgrade Wizard (n)~ A wizard which is used to upgrade Visual SourceSafe to Team Foundation Server. Upgrading your code projects files version history labels and user information from Visual SourceSafe to Team Foundation Server (TFS) or Visual Studio Online version control has many benefits for your team. TFS version control is a modern version control system that is fully integrated with the suite of ALM tools in Visual Studio 2012 and Team Foundation Server.