FSU Retirees get to keep their JES email accounts exactly as if they were an active employee still. The only difference is that since they aren't active employees they fall into the 250MB quota category, rather than the 1GB quota category. (That doesn't mean UCS will delete all of their emails that go over 250MB when they retire though.)
Employees who are retired get to keep their Exchange email box unless they request to have it deleted. The email quota is the normal 100MB.