They should follow these steps:
a. Start Visual Studio 2013
b. Open Team Explorer and connect to the new TFS Server
c. Confirm that they can:
. Source Code - Browse the projects and code using the Source Code Explorer
a. Source Code Operations - Get Latest on a file, make a change and check in
b. Source Code History - View the history of a number of files in different projects
c. Work Items - Browse and view recent work items
d. Open Visual Studio 2015 and repeat steps 1 to 3.
e. Test that your builds complete successfully on the upgraded build controller(s) and agent(s).
f. Check that they can create a new Team Project in Visual Studio 2015
Congratulations! You've completed a successful migration!