Next weekend, I'll be migrating my Exchange environment from 2003 to 2010. I have a new 2010 Exchange server ready to go. It will act as the Client Access, OAB, Hub Transport, and Mailbox server roles. All the roles are installed and ready to go. My question is if I'm moving all users from 2003 to 2010 at the same time, do I need to create send connectors? I don't plan on leaving the 2003 box active. Thanks.