So it is official now. Office Communications Server 2007 R2 (Wave 13) will support 64 bit OS as the only Operating System (So no 32 bit support).
Within the MVP community there has been a lot of discussion about the good/bad in this design decision, but personally I think that most of our customers are 64-bit ready due to Exchange 2007 and in general won't see this a big issue. Yes, it will mean that we will have to migrate our servers, but as a consultant I would (almost) never suggest using in-place upgrades anyway.
What is your opinion about this ?
Read more here Next release of OCS to support 64 Bit OS (x64).