I am needing some of the same help.
YES, My exchange box is set up with POP & IMAP turned on automatically in the services MMC. I am on Exchange 2003 on a windows 2003 sp2 machine.
NO, my osTicket is on a seperate server as my Exchange box. osTicket is on my MySQL box though.
I am planning on upgrading to Exchange 2010 in a few weeks; if that matters.
Any help would be appreciated.