A new feature of Visual Studio 2013 is the ability to sign in with a Microsoft Account and have your settings be persisted across all of your instances of Visual Studio, amo
what worked for me was to go to Team explorer in VS2013 and under 'connect' you'll see a link saying 'select team projects'. click this and a window opens asking you to select the project but in the bottom left corner of this window there is a (switch user) link, just click this and use your new id. simple