Check out the Unified Communications TechNet Virtual labs covering the many topics such as: deploying and configuring, enabling users and installing, configuring and using conferencing, using management and troubleshooting tools, compliance and archiving, and unified messaging at http://www.microsoft.com/events/series/unifiedcommunications.aspx?tab=virtuallabs

Microsoft Office Communications Server 2007 Virtual labs:

Microsoft Office Communicator 2007 Virtual labs:

Microsoft Exchange 2007 Virtual labs:

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