Continuing with the celebrating 25 years of Microsoft Press theme, our good friends at Microsoft have release two "free and full edition" eBooks for your downloading pleasure.
Programming for Unified Communications with Microsoft Office Communications Server 2007 R2
http://csna01.libredigital.com/?urrs4gt63d
Microsoft Office Communications Server 2007 R2 Resource Kit (I was looking to buy this for work!!)
http://csna01.libredigital.com/?urws8un4p7
Get them while there hot, and available!
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