All the searching on multiple e-mail has focused on BES -> BB and BIS/BWC -> BB. How 'bout BES(1) -> BB and BES (2) -> BB?

I use mailstreet for personal/consulting (Outlook Mail/Cal/Contacts/Tasks) on my 8700 (Cing), but have a 7105t (T-Mob) from work.

Since T-Mob's reception bites, I forward all my calls to the 8700 but I still have to carry the 7105t for work e-mail. Can I just ask the work BES admin to send the messaging service book to my 8700?

Thanks in advance,
paul