Exchange Migration

Are you going to leave the old server up or replace it with the new one? That makes a big difference on what you need to do. If you're leaving the old one up the mailbox move is pretty easy. Just make sure you disable your anti-virus software before moving them as they can often mess up a transfer (and make sure to turn it back on afterwords). Also make sure you move the mailboxes when the users aren't using them. That could be bad.

If you are replacing the original server check out this link for the process:

http://www.swinc.com/resource/exch_faq_appxa.htm

(there shouldn't be any spaces in that URL)

Good luck!
-Heath

Build your new server as an exchange server, and join your current site, then you can move user by user to the new server, using build in exchange features, then you need to rehome all you public folders and DL's, Also move your IMC to your new server, after you have every thing moved wait about a week before turning off your old server, when you do make sure every thing still works, then you can delete the old server from your site.

However, there is an alternate procedure called a "forklift" upgrade where you do an off-line backup of the Information Stores and restore it to the new server. This is my favorite approach because the old server remains fully functional until you're sure the new one is okay.

A couple of resources for you from Microsoft's Technet site:
Q199954 describes the forklift procedure
Q155216 describes the move
Q152959 provides information on removing the original server from the LAN after the new one is up (not necessary with the forklift upgrade)

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