I have successfully (somewhat) setup an exchange 2003 coexistence with 2010. Mail is flowing fine and active sync is working. The problem is that active sync and public folder access isn't working for the one test user that I migrated to the 2010 server. All the mailboxes still on 2003 can see public folders and use active sync with no problem. The one mailbox that I migrated to the 2010 server cannot access the public folders and cannot use active sync. I have enabled 'expert' diagnostic logging for public folder replication but nothing is showing up on the event log and I am not sure where to look for the active sync issue. Please help me out EE.