I need to migrate several (50+) team project collections currently hosted on TFS 2010 to TFS 2012. The current installation must be running so that the teams still can check in work items.
I haven't been able to find a detailed guidance on how to COPY the team project collection to the TFS 2012 server without having to detach the collections in TFS 2010.
Can someone provide a detailed guidance how to accomplish this?