Share Free/Busy information between two Exchange servers

We acquired a company that is on the other side of the globe - they have their own Exchange server/network etc & there is not a plan to integrate the two at this time.  That said, since we have a lot of meetings between us, it makes it really hard to plan.  Is there a way to share, across the internet (securely), free/busy information?  I saw http://support.microsoft.com/?id=238573, but I am not sure how that would work across the internet securely.  

What do various organizations do?
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rustyrpageAsked:
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tomex07Connect With a Mentor Commented:
I'm not sure about that, surely RPC protocol and replication messages between public folders.
But anyway you will need a VPN to make communicate the 2 exchange servers so it will be secure by design from internet threat.

From the company point of view Microsoft said int he KB:
Security
Whenever information is accessed on an Exchange Server computer from another domain or organization, a security breach may occur. The InterOrg Replicator utility helps maintain the privacy of the shared information while it is being duplicated between Exchange Server organizations. Additionally, secondary information, such as the number and names of folders on the opposite Exchange Server computer, is not available to either system administrator.
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tomex07Commented:
The KB you found will do the job but to secure the communications over internet, you have to set up an VPN connection between the two organisations.
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rustyrpageAuthor Commented:
What type of data is there going back & forth?
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