Delete USMT user state after successful deployment or on timer
Just paint this picture: 300+ Win 7 Clients are to be upgraded (scanstate, wipe+load, loadstate) to Win 10 using the SDA (and build in tasks). The list of possible user states to restore will be to long to click "Start Installation" after three or so upgrades.
Suggestion: Mark USMT user state as to be deleted after a successfull restore. On timer (once per night?) delete marked user states.
Possible plus: Add a checkbox to the USMT user state's details page: "Don't cleanup"