I'm hoping someone has some insight as I've been fighting with this issue for months =\ I picked up Snow Leopard the day it was released for 1 feature in-particular...Exchange integration within Mail.app, iCal, AddressBook, etc. My corporate email is all Exchange 2007 based and shortly after I installed Snow Leopard I set up my account in Mail.app and it worked beautifully, for about 1 month. After that and out of the blue I started experiencing some major issues. About 60% of the time when I go to my Exchange account in Mail.app NO messages will show up in my Inbox or sub-folders. When they do show up, about 50% of the messages in the list I click on will not show any content from the body of the message or the headers. In addition, my inbox which probably has a measly 500 messages only shows about 100. Some folders show their content and some don't. I do not understand why this issue started to happen after it was working PERFECT for about one month. I have deleted the account and re-added several times. I've also completely reinstalled Snow Leopard from scratch a few weeks ago and the problem still persists. Someone somewhere mentioned Mail.app had problems with a lot of messages which I didn't have to begin with, but I cleaned up about 60% of my mailbox in Entourage yesterday and then tried again...same issue. Keep in mind during all of this, Entourage works perfect as well as Exchange OWA. Thanks for any help, it would be such a relief to get this fixed. Entourage isn't that bad, but I hate having to flip-flop between Mail.app and Entourage for my personal and work accounts.