I don't know if I am over complicating this or over simplifying but I am in the process of upgrading exchange 2003 to exchange 2010. I am following the Deployment Assistant that is part of the Exchange 2010 installation. I have gotten to the "Move Mailboxes" section and struck by fear I have stopped. Here are some questions I have that the Deployment Assistant doesn't tell me.
1) After I move the mailbox's does exchange automatically know that the new server is now THE mail server and all email should come and go from the Exchange 2010 server as apposed to the old 2003 server?
2) When I add a user to active directory I was always prompted to add an exchange mailbox. Does Active Directory now know to add that mailbox to the new 2010 Exhange?
3) We use Postini. In our current Exchange 2003 configuration I have the Postini IP range set up under the Default SMTP Virtual Server as allowed to access the virtual server. I then have a policy on our firewall allowing traffic in on port 25 and then forwarded to the Exchange 2003 server. Am I correct in believing all I have to do in Exchange 2010 is enter the Postini IP range under Hub Transport receive connectors and then forward the policy to the new Exchange 2010 server and I magically will start receiving email?
Any help talking me down off the ledge here would be greatly appreciated.