What I would like to do is upgrade our TFS 2012 express to the TFS 2013 express.
There are many guides telling how to upgrade from express to something else (from free to non free) but I can't seem to find how to upgrade from express to express.
I don't even know if such a migration is possible or allowed by Microsoft due to the fact that the express edition is free etc.
What I have tried so far is run the installer of TFS express 2013 on the server that has TFS express 2012 installed to se if any upgrade option appear. I went far enough in the wizard and no sign of an upgrade option so I hesited to press install because I didn't know how running two instance of TFS on the same server will behave.
I would appreciate the help if any of you has found a way to do this.