We have a client that we can not get their Iphones to sync to their Exchange mailboxes. OMA and OWA work fine. Setting up a test account on the server works fine. Sending and receiving email to and from the test account works fine. The test account was created by copying one of the problem accuounts in AD. The only major difference between the test account and the copied account is mailbox size (21KB vs 2.6GB). On the problem accounts the mailbox folders are populated on the iphone but there is no content in any of the folders. Any ideas?