The Resource Kit Tools for Office Communications Server 2007 R2 (version 6907.0) was released in February 2009.
You can use the set of deployment, technical tools and references to complement the product documentation delivered in R2. Supported platforms to run the ResKit Tools are Windows Server 2003 Service Pack 2 and Windows Server 2008.
Note that the tools should be used exclusively with OCS 2007 R2 (RTM) only. These are essentially the same tools shipped in the updated OCS 2007 R2 Resource Kit.
Download and more information here.