I am not able to access both the Source control in Visual Studio 2010 as in 2012 when I try to access this error is shown: "TF14045: The identity is not a Recognized identity". This error started after I detach the project collection from TFS 2010 and attach on Team Foundation Server 2012, anyone knows how to fix this?
Never had this error, because the migration is planned for January, but I found this entry with some suggestions and answers from MS:
http://social.msdn.microsoft.com/Forums/en-US/tfsadmin/thread/b67ad1d6-d763-4602-bf14-489a3389a30d