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this may give you some idea<br />
<br />
<a href="http://blogs.technet.com/b/exchange/archive/2011/03/04/3412075.aspx" rel="ugc">http://blogs.technet.com/b/exchange/archive/2011/03/04/3412075.aspx</a>
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I have 2 forest that I need to have the Global Address Lists and calendar to sync together.<br />
I know there is the Federation service but this is only for about 40 users and I wonder if it is worth going through setting up the Federation or use the third party software that is out there to do this??<br />
Any suggestions??
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How would I sync up the up the Global Address Lists and calendar information between two sites, or forest with exchange 2010?<br />
What is the steps for doing this?
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How would I sync up the up the Global Address Lists and calendar information between two sites, or forest with exchange 2010?
What is the steps for doing this?

How to sync the Global Address Lists and calendar information between 2 forest

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.