Just to clarify. Currently only Voice Ready for Microsoft Office Communicator partners can use the R2 RTM bits in production.
This partners will have the bits (R2 RTM) 6 weeks earlier before the official launch at the 3rd of Feb 2009. Customers are not be able to use or buy R2 before the 3rd of Feb 2009.
Source: “Office Communications Server 2007 Release 2 will be sent off to manufacturing on Dec. 19th and will have a worldwide virtual launch on Feb. 3rd, 2009”