I'm currently in the process of migrating a 2003SBS box that's using a 3rd party POP3 connector with a TON of mailboxes. During the process of the migration I'll be eliminating the 3rd party POP3 mail service and have mail directly delivered to the new SBS2011 server. I don't want to have the 2011 box start receiving mail until after I've setup my anti-spam product so here's the big question:
If I start moving mailboxes are they still replicated between both servers until I remove exchange from the 2003 box? If so I'd think I could still have the pop3 connector shove mail into the 2003 box and have it replicate to the 2011 one until I can get antispam setup and change mx records.