I was upgrading a Exchange 2003 to a Exchange 2007, but have some troubles move some accounts to my Exchange 2007 server, it fault whitch this error:
Summary: 1 item(s). 0 succeeded, 1 failed.
Elapsed time: 00:00:10

XXX
Failed

Error:
Error was found for XX because: Error occurred in the step: Preparing mailbox to be moved. Failed to copy basic mailbox information with error: The Microsoft Exchange Information Store service could not find the specified object., error code: -1056749241

Exchange Management Shell command attempted:
‘141fc3d8-c100-46e6-b402-fc653b26afe4’ | move-mailbox -TargetDatabase ‘CN=Mailbox Database,CN=First Storage Group,CN=InformationStore,CN=XXXX,CN=Servers,CN=Exchange Administrative Group (XXXXX),CN=Administrative Groups,CN=First Organization,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=XXXX,DC=net’

Elapsed Time: 00:00:10

Some search on the internet and I found out that is using the address list to move a account. And that this users has been set to be hide from Exchange Address list, so removing this checkmark and now the user can be moved.