Presently we are running VS 2008/TFS 2008 on Windows 7. All of our manual/regression testing is accomplished with Excel. We intend to upgrade to VS 2012/TFS 2012 in the near future (remaining on Win 7 as far as I know) and I am planning to move all of our manual tests into MTM. However, it is still an undetermined amount of time before the upgrade will occur due to some unexpected upheaval. Would it be feasible for me to install 2012 on my machine and connect to our TFS 2008 so that I could go ahead and begin this process? If yes, will it be a major headache transitioning from TFS 2008 to TFS 2012 as far as migrating the test plans when the time comes?