The full documentation pack for OCS R2 is now available for download.

The full set of Office Communications Server 2007 R2 documentation is contained in the download file named Communications_Server_2007_R2_Documentation.chm.  Selected, high-value sections of the documentation are also provided as separate Word documents.

http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=e9f86f96-aa09-4dca-9088-f64b4f01c703