i have the same problem all the time the only fix i get from it is go to your tmobile and send service books and restart your phone.......it happens alot..
my friend's 9000 that is Personal Argentina branded, with os 5.0.0.411, can use the mail setup app.
another friend, with a 8520, which came with os 4.*, and was updated to 5.0 before even using it, and that phone IS personal branded, has the same problem as us.
Last edited by rcocchiararo; 02-04-10 at 09:14 AM.