We curently have one parent domain and three child domains under the parent. We are looking to migrate to exchange 2010 from Excahnge 2003. We are having some domain issues and want to start a new domain and migrate slowly over from the old. We want to start wtih a 2008 domain and install exchange 2010 in the new domain. Can we slowly migrate email users from the old domain to the new exchnage server or do it have to be a all at once migration? We would like to slowly move users but how do we handle the mail between the two exchange server? How will it know where the user resides?

When you say "new domain", do you mean a new domain in the current AD Forest or a new domain in a brand new AD forest?Tim Harrington - Catapult Systems - http://HowDoUC.blogspot.com

A new domain in a brand new AD forest

Hi You can cross forest migrate the user accounts and mailboxes to the new forest http://msexchangeteam.com/archive/2010/08/10/455779.aspx http://msexchangeteam.com/archive/2006/11/02/430289.aspx http://www.testlabs.se/blog/2010/05/24/cross-forest-migration-in-lab/Jonas Andersson MCTS: Microsoft Exchange Server 2007/2010 | MCITP: EMA 2007/2010 | MCSE/MCSA Blog: http://www.testlabs.se/blog