One of my bosses accesses his mail only remotely and does not like the WebAccess method of using his mail. He would prefer to use Outlook. So I am going to open up a POP or IMAP port for him only in our firewall.

Do I just enable POP/IMAP on the POA and the GWIA and that's it, or is there any additional configuration required?

Also, will he lose functionality (i.e. being able to access address books, calendar, etc.) by going with a POP/IMAP connection?