Hi all, two company (A and B) with forest-trust enabled. They are going to migrate company B users to company A. (windows 2003 envir. company A has exchange 2003 and company B has exchange 2007) just wonder whether company A builds the exchange 2007 server which is going to use exisiting company B's exchange MDB file? or move their mailboxes from exchange 2007 to exchange 2003? Thank you for your help.

You have no choice other than to move mailboxes. The two database formats are not compatible. "SGryzbowski" wrote in message news:1cd1a20d-4b6c-405a-9677-06a7897f9797... Hi all, two company (A and B) with forest-trust enabled. They are going to migrate company B users to company A. (windows 2003 envir. company A has exchange 2003 and company B has exchange 2007) just wonder whether company A builds the exchange 2007 server which is going to use exisiting company B's exchange MDB file? or move their mailboxes from exchange 2007 to exchange 2003? Thank you for your help. Mark Arnold, Exchange MVP.

Agree with mark, Databse structure is different in both flaviour, You must be move mailbox from Exchange 2003 to 2007, Then you can use lots of flexible feature of 2007 like Data Portability for use DB into other place. http://technet.microsoft.com/en-us/library/bb123954(EXCHG.80).aspxAnil