Okay environment is Virtual Server 2008 Exchange 2007 standard sp1.
I succesfully setup segregated address list and autodiscovery.
The issue I am having is with linked Mailbox's.
All works fine with OWA.
But when I try to connect via outlook it cannot see that maillbox.
I've tried re-enabling the disabled user account.
Checked that the user is in the GAL with the other "user mailbox" accounts. (which work perfectly fine and are visible in the list when querying the mail server)
Tried exporting autodiscovery to the other domain, didn't work.
(spent hours trawling google)
I thought it may be an issue with the default GAL but it is working fine for the other mailbox types.
I am leaning towards an attribute that is hiding it from the list when an outlook client query the mailbox list.
Anyone got any ideas?