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
Start Visual Studio
Tools -> Import and Export Settings -> Export selected environment settings
You need to be really quick to navigate the menu before Licensing pop-up appears, (this step is optional: worst case scenario you would have to restore all the settings manually).
Once in "Import and Export Settings" dialogue you can relax.
Exit Visual Studio.
From the command prompt run:
devenv /resetuserdata
for the particular Visual Studio version.
Safest way is to right-click on the shortcut -> Properties -> Shortcut -> Target -> copy.
Final command should look something like:
"C:\Program Files (x86)\Microsoft Visual Studio NN.N\Common7\IDE\devenv.exe" /resetuserdata
Go through log-in and initial settings.
Tools -> Import and Export Settings -> Import selected environment settings
to restore your original settings.
This worked when the error:
We were unable to establish the connection because it is configured for user email@address but you attempted to connect using user email@address. To connect as a different user perform a switch user operation. To connect with the configured identity just attempt the last operation again.
...has both instances of email@address identical.