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Trust link between Exchange 2010 and Exchange 2013 to Share Calendar

Posted on 2013-11-18
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Last Modified: 2014-01-28
Hi

Is it possible to link two exchange servers to share a calendar?
I have a customer who is running Exchange 2010 who purchased a separate company that has its own network and runs as its own entity.  In terms of IT the second company has its own network, we recently updated the network and installed Exchange 2013.  

The sales team would like to be able to share a sales calendar sitting on the Exchange 2010 network to certain employees running on the separate network, is this possible with some sort of trust link?

Thanks
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Question by:bains1000
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Adam Brown earned 500 total points
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Yes, you can do this. Exchange 2010 and 2013 support Free/Busy sharing via the Microsoft Federation Gateway system. http://technet.microsoft.com/en-us/library/dd638083%28v=exchg.150%29.aspx has some information on the Federated Sharing feature of Exchange 2013. http://technet.microsoft.com/en-us/library/dd351109%28v=exchg.141%29.aspx Explains implementation with Exchange 2013.

Basically you just need to have valid Third Party certificates installed on your CAS servers in both environments, then set up a Federation Relationship with the Microsoft Federation Gateway. Once that's done on both ends, you can then create a sharing policy and organizational relationship between the two organizations to share free/busy information.

I should also point out that this will *not* allow you to share GAL information. This requires the use of Forefront Identity Manager's GALSync feature.
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