I have a customer who is interested in purchasing sbs 2003 mainly because of the collabaration possibilites of Exchange. Currently, users have pop3 accounts hosted by a isp and use outlook 2003 to download mail directly from the isp. If after creating mailboxes on the exchange server and using the pop3 connectors on exchange to download mail to each mailbox, would all the functions of exchange eg. shared calendar be available to the end users? If not, how would I go about it?