Chris mentioned to me and Rennie that Kerio was an old time Mac solution that does just about everything. They support Outlook directly with their own MAPI provider, they support Entourage as well directly. They also do Blackberry sync and iPhone as well without needing anything else in the middle. He said that “Big Mountain”:http://www.bigmountaindesign.com/ does this kind of hosting. The cost is reasonable. It is $6.50/1GB of email/month/user with each additional GB, $3.50.