How do I migrate resource mailboxes?
GroupWise resource mailboxes cannot be logged in to, using regular user/password credentials. To migrate resource mailboxes, you must therefore use a trusted application key, which allows a single account to log in to all GroupWise mailboxes.
There are more complex scenarios where a GroupWise shared or resource mailbox has no user name associated with it, and it can only be logged in to using GroupWise "proxy access". In this case, we won't be able to authenticate and log in to that mailbox and consequently, we will be unable to migrate it.