I am about to begin migrating my 2003 mailboxes over to 2007. I have Outlook RPC/Anywhere users, ActiveSync users and a couple imap4/pop3 users. If I switch the incoming mail link over to my 2007 server, will all of the above users be able to get to their 2003 mailboxes by going thru the 2007 server? The 2007 server has all roles installed since we are a small company and no edge server is needed. My initial testing didn't work so much. I assume there MUST be some kind of configuration on the virtual directories that can make this happen successfully. But then again, who knew this was a leap year....