I recently migrated Windows SBS 2003 to a new hardware. Everything went smoothly until I shutdown the old SBS server. When I shut it down none of the users can connect to the Exchange server. All other access works fine, ie shared directories, logins, internet, printers. etc. The users are all using Outlook 2007 for their Exchange clients. All mailboxes were moved to the new server. I verified that Outlook was configured to connect to the correct exchange server. DHCP points all of the clients to DNS on the new server.