We have a partner division on our network, they have thier own domain(s) but we provide email for them. We have no control over thier domain at all, we have a two-way trust and thats as far as our connection and access goes.
Our Domain (A) has accounts and mailboxes, we add thier users to the mailboxes using associate external account permissions (Exchange 2003).
Domain (B) is thier users accessing mail using outlook. Working well at the moment.
Exchange 2010 migration - from Exchange 2003, some accounts were not migrated as Linked Mailboxes, we need to convert them.
Here is the question: What permissions do we need on Domain B if any, to be able to carry out mailbox additions (linked mailboxes) and conversions of the few that need it. Domain B owners are reluctant to give us any rights other than a basic user (AD read).