SSMS 2012 does not work with VSS 6. We installed modern source control, TFS 2010 server.
Then I Installed Team Foundation Server MSSCCI Provider 2010. However the only choice for Source control plug-in in SSMS 2012 is still VSS6. My VS2010 works just fine, I could connect to TFS in a team explorer.
How to add TFS as a second source code control plugin in SSMS 2012?