I suspect this is not going to make any sense, but I will try anyway. I have had the Thunderbolt for 8 months and Eris before that. I never had a problem syncing with my Outlook account through OTA via Microsoft Exchange. I recently changed to a Windows 7 PC. Email syncing is working fine. Contacts (with a few weird kinks I cannot figure out) is working fine. But all my appointments on the phone are gone. I am wondering if there is some small nuance that I am missing when I set-up Microsoft Outlook on my new computer. And yes, when I go check webmail (as opposed to Outlook on my PC), appointments are there.