I\'m using TFS Preview (Team Foundation Service) with one of my projects with Visual Studio 2012. I\'m also using an on-premises TFS server with most of my projects. When I
In VS 2015 it can be achieved by
Team Explorer > Connect > Manage Connections
and selecting the team project again. In case of there exist more than one account in VS, Team Explorer asks for which account to use to connect to the team project.