UPN cross forest

Hi All,

We have an turst forest between dc.local and exc.local on the dc.local we have a upn @domain.tld and on the Hosted Exchange farm we also have the same domain.tld. Now we have created a linked mailbox to that user but he only can sign in with dc\username
We wants that he also can sign in with username@domain.tld.

If we create a user on the Hosted Exchange farm it is possible to sign in with the domain.tld but when we created a linked mailbox to dc we only can sign in, in OWA with dc\username

Greets and Thanks
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Take a look at this article : http://blogs.technet.com/b/exchange/archive/2008/04/18/3405388.aspx

Can you confirm that the linked mailbox has been created the same way ?

Thanks !

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