I have, in the recent past, migrated several clients to MS Office 365 Hosted Exchange Services from various versions of MS Exchange Server including Exchange 2003. I like the ability to pre-populate the online user mailboxes by moving the mailbox data but not moving the actual mailboxes before making a final DNS cutover to the new site.
Is it possible to do something similar when moving from local legacy Exchange Server to a new local Exchange Server 2013?
If not, are there easy ways to move large mailboxes without inconveniencing the owners of those mailboxes?
Finally, when migrating from SBS2003 to SBS2008 (or SBS2011) Microsoft automatically set up bridgeheads and connectors that allowed all mail to flow from the legacy server until the final cutover was made. To accomplish this task in Exchange 2013 should I simply setup a second public IP address for the new server and make sure that there is mail flow through the firewall and email gateway service provider before I move any mailboxes?
I realize that I've asked three separate, but hopefully closely related, questions. If someone can provide an easy "best practices" approach to my answer I'll be grateful.