I just upgraded from 6.0.1 to 7.1 over the weekend. It went great

except for the Blackeberries.
The way they are setup, is for the carrier to check through IMAP if there is any new mail. It does not work anymore with 7.1.
What do I need to open to allow for IMAP. The Blackberry proivider does not support IMAPS, only IMAP. How do I enable IMAP remote access?
I don't want to use the local delivery & forward emails to the Blackberry address. I only want the email to be picked up by Blackberry if they are not at their desk with their Outlook open.
Thanks