Day 2 seems to have been Windows Server Day at WinHEC 2007 with Bill Laing, general manager of Microsoft’s Windows Server Division orchestrating the show. While there were some spiffy demos (e.g. hot swap) the only new news seemed to come out in the discussion of the roadmap for Windows Server operating system products (,) where it was revealed that Windows Server 2008 R2 would be 64-bit only and that Windows Server 2008 would be the last 32-bit operating system, client or server, that Microsoft would release. Presumably that injunction does not apply to variants of Windows Server 2008 like Home Server which in beta, at least, are 32-bit and of course versions like Centro and Cougar (i.e. Small Business Server) were already scheduled to be 64-bit only because they include Exchange 2007 which is 64-bit only.
Windows Server OS Roadmap
Finally, Mark Russinovich’s interesting keynote description of some of the kernel changes in Windows Server 2008 (e.g. no more specific uniprocessor kernel variants) is summarized by Peter Galli at eWeek.