In a speech at a supercomputing conference held today in Seattle, Bill Gates
announced that future versions of some of Microsoft's server products, including the new Windows for Clusters, Longhorn Server and Exchange 12, will only be available for 64-bit x86 processors.
Exchange Server 12 is expected to be released in late 2006, although that date may end up being pushed back. Longhorn Server is due for release in 2007, after the client version of Windows Vista. In addition, the small business edition of Longhorn Server, as well as Microsoft's
Centro mid-market software bundle, will also be getting the 64-bit treatment. While the idea of Longhorn Server products being released for 64-bit exclusively has been
rumored for quite some time, this is the first official confirmation from Microsoft.
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Ars Technica