Recently, I have made some research on an issue happened during Exchange Migration (2003 to 2010 or 2007 to 2010)

Issue:

After transitioning from Exchange 2003 (or 2007) to Exchange 2010, you get the following error when trying to create a new e-mail address policy: “You can’t specify the recipient container because legacy servers are detected”.

Resolution:

This happens because there are still traces of the old Exchange server(s) within the orgainisation in Active Directory. If you are certain there are no legacy servers remaining, do the following to remove them:

1. Launch ADSI Edit.
2. Browse to the following location:
3. Configuration [server.domain.local] > CN=Configuration, DC=domain, DC=local > CN=Services > CN=Microsoft Exchange > CN=DOMAIN > CN=Administrative Groups > CN=first administrative group > CN=Servers > CN=server
4. Locate the old server(s) and delete them.
5. You will need to wait for AD replication if you have multiple DC’s.
6. Create the policy.