I am trying to move a mailbox from 03 to 07 in a different forest. I am new to the power shell for exchange 07. I do have a forest trust in place and dns is working correctly. Here is my setup: Old forest with exchange 2003: exchange server name = exchange domain controller name = exchange (bad setup I know, it's all on the same box) domain name = okchs.org New forest with exchange 2007 exchange server name = exchange2007scc (it is a single copy cluster using a san) domain controller = varietydc01 domain name = varietycare.org I'm not sure what the correct name for the exchange 2003 database is, from looking at it, it looks like \First Storage Group\Mailbox Store\ Here is the cmdlet I am running: $s = get-credential get-mailbox -DomainController 'exchange.okchs.org' -Credential $s -database 'exchange\First Storage Group\Mailbox Store' |move-mailbox -TargetDatabase 'exchange2007scc\First Storage Group\Mailbox Database' -Identity 'test1' -SourceForestGlobalCatalog 'exchange.okchs.org' -GlobalCatalog 'varietydc01.varietycare.org' -DomainController 'varietydc01.varietycare.org' -NTAccountOU 'CN=Users,DC=varietycare,DC=org' -PreserveMailboxSizeLimit -IgnorePolicyMatch -SourceMailboxCleanupOptions DeleteSourceMailbox -SourceForestCredential $s -TargetForestCredential $t here is the error i get: Get-Mailbox : Database "exchange\First Storage Group\Mailbox Store" was not found. Please make sure you have typed it correctly. At line:1 char:12 Please any help would be great!

Check this shell command here http://technet.microsoft.com/en-us/library/aa997145.aspx.Also check the pre requsities that are described here for cross forest mail box move.Raj

Besides,you can refer to exchange team blog:Exchange 2007 Cross Org Mailbox Migrationhttp://msexchangeteam.com/archive/2006/11/02/430289.aspx