For migrations from other e-mail platforms to Exchange, you probably want to have full access enabled for a certain Exchange-account to facilitate the migration without having to set up complex access rights. Exchange has something called application impersonation, which allows a user to impersonate other users to access individual mailboxes, which comes in very handy during a migration.

In order to set up application impersonation, you need access to the Exchange Management Shell (EMS), with an account which has permissions to set up access rights.

Exchange 2007 does not support application impersonation as in Exchange 2010 and up. Impersonation does exist but has to be set on each indivi  ...