Using Outlook 2003 or Outlook 2007, can a user access a delegate mailbox, if
the delegate is in a different Active Directory forest/domain?

Due to reorganization in the company, Administrative Assistant is in domain
A1 but the Executive is now in domain B2.

A1 and B2 are in different forests. There is a cross-forest trust
available if that matters.

Is there some way that Admin Assistant can continue to be a delegate for the
Executive? Admin Assistant would like full access to the Executives
mailbox and calendar. Admin Assistant would like to keep the ability to
"Send As" on behalf of the Executive.