How to grant Exchange Administator rights to users from a trusted domain (different forest)

We have two domains (seperate forests) with a two-way trust between them.  I want to give some users in DomainA administrative rights for the MS-Exchange 2007 server in DomainB.

The "Exchange Organization Administrators" group is a Universal group, and it seems it cannot contain users or groups from a different forest.  

Any suggestions?
LVL 12
Carlo-GiulianiAsked:
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Create a Group that will be member of this Group and make DomainA users of that new group

- Rancy
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Carlo-GiulianiAuthor Commented:
I tried that.  A universal group can contain only global groups or universal groups from the same forest.
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AkhaterCommented:
Universal groups can contains members from any forest, anyhow this should help you

http://technet.microsoft.com/en-us/library/bb232078(v=exchg.80).aspx
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Carlo-GiulianiAuthor Commented:
The article link from Akhater is exactly what I need...but I am going to give his response a low "quality" score because he is completely wrong about universal groups.  To quote , support.microsoft.com/kb/884417 "A universal group is a security or distribution group that contains users, groups, and computers from any domain in its forest as members"
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