Sure, as far as I know they are on 1.8, ie you cannot set different From: addresses for each email account.
The instant email is only apparent if the email is sent to the users instant
email account i.e
![[email address]](http://www.blackberryforums.com/?emailimage=87b1babd8da378e2790cfa0582949998)
here in the UK on tmobile.
Other accounts which you have added are polled for new mail periodically, I heard it was every 15 mins for standard POP account, may be wrong on that one though?
Mike