I have a customer that has a windows 2003 small business server. They want to use Exchange but do not want to host their email. So basically exchange is the mail box store and they utilize cal sharing and contacts. We hav their POP 3 mail server settings setup as the default mail, with exchange setup as the profile. When they send email it sometime's is sent from domain.local, where it should be domain.com if it was using their outside ISP. Obviously people cannot reply to domain.local. Also Ical's default to exchange and they can go up to account and select the isp and it seems fine. If they forget they are out of luck.