Bit of a funny one, I am going to start hosting mailboxes for users on a child companies domain.
Just so you know I already have a two way domain trust in place.
I have two questions,
Firstly, is it necessary to create a linked mailbox for each user in our domain then transfer mail somehow from the original mailbox to the linked or can I migrate a mailbox from their domain to ours then grant access to the original NT account in the their domain?
Secondly, given that I would like to perform a gradual migration is there a way that the new linked/migrated mailboxes in our domain can still have access to the GAL in their original domain?
Hope that makes sense, please don't ask why we are only moving mailboxes and not just migrating users to the new domain, it wasn't my idea.