Moving Exchange 2003 mailboxes to Exchange 2007 or Exchange 2010 in a completely different domain
Posted on 2011-09-30
Our company, let’s call us CompanyA, has been purchased by another company, CompanyB. These companies are not in the same geographical area and we are not on the same domain or network – 2 completely separate entities still.
CompanyA is running Exchange 2003 SP2 on Windows Server 2003 Standard. CompanyB is going to upgrade from Exchange 2007 to Exchange 2010 before the end of 2011.
CompanyB wants to migrate our mailboxes, distribution lists, and mail-enabled public folders to their Exchange server, but are not sure if they want to do this before or after the upgrade.
Our domain is called companya.com and their domain is called companyb.com. After the migration, we will retain companya.com as our primary email address, but also will begin using companyb.com.
Is there a "simple" way to perform this task? I’ve researched online and found ideas with Exmerge, which doesn’t sound like it will work between the two different versions of Exchange, and read a little about cross-forest migration, which sounds really “involved”.
I’ve got some other ideas of my own, but wanted to see what the Exchange experts have to say.
I realize that there are DNS records to take into account, but at this point, I’m more interested in the actual Exchange mailboxes getting moved to the new server and platform.