I am running Exchange 2003 with a Self-Signed Certificate, this is all working correctly, the instructions to get this working were simple and easy to follow. Syncing happened fine for a while, using a mixture of Always On, Manual etc Now, I get the above message evertime it syncs, I have tried syncing just one item type at a time, contact, and calendar both sync with no problem, so the issue is something to do with e-mails