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We have two sites with exchange 2007. Users are not able to see free/busy information of all other site users. <br />
Please let me know what to do.
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We have two sites with exchange 2007. Users are not able to see free/busy information of all other site users. 
Please let me know what to do.

Unable to see free/busy information of all other site members

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.