Exchange 2010

Can some one assist me with the EMS syntax need in order to add a cross forest permission to a user on a mailbox and also how to make it available in outlook 2010. The below syntax is what I have tried and it seems to go through with no error but i cant get it to show up in outlook:

add-mailboxpermission -identity "mailbox" -accessrights fullaccess -Inheritancetype All -user user@trusteddomain.com

I then went to map the mailbox in outlook but the name is unresolvable, and i tried to user the FQDN. We do have a 2 way trust between our domains. Am I missing anything?
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timgreen7077Exchange EngineerAsked:
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AmitIT ArchitectCommented:
I don't think the way you are trying to configure will work, use OWA for secondary mailbox, which I see is much easier to use.
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Simon Butler (Sembee)ConsultantCommented:
Add the second mailbox as an additional ACCOUNT through Outlook 2010, not an additional mailbox. That should work for you. You cannot add the second mailbox as an additional mailbox because it outside of the forest.

Simon.
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