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How to Configure the Availability Service for Cross-Forest Topologies

Microsoft

Mar 04, 2011

The Availability service improves information workers' calendaring and meeting scheduling experience by providing secure, consistent, and up-to-date free/busy information. By default, this servic...

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Exchange Team Blog

You Had Me at EHLO..

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Mar 09, 2011

Hi Binny,

A shared SMTP address will not work because an important component in this scenario is autodiscover service and you cannot have it the autodiscover DNS A record pointing to two different forests. In this case the solution then is rely on Public Folder replication cross-forest for free/busy information.