Sync room booking mail box between two exchange 2010 in two company

There are five meeting rooms are shared by two partner company.
We want to allow users from two company to reserve meting rooms by outlook.
Is it possible to sync room mail box between multiple exchange 2010 in multiple company?

Thank you.
dickchanAsked:
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David Johnson, CD, MVPConnect With a Mentor OwnerCommented:
yes you must enable cross-organization http://technet.microsoft.com/en-us/library/bb125182.aspx
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