a little humility goes a long way.
From MS: http://technet.microsoft.com/en-us/bb232170.aspx
Exchange 2007 is available in two platform versions: one platform version (the 64-bit version) is for live production environments and the other platform version (the 32-bit version) is for non-production environments (such as labs, training facilities, demo, and evaluation environments). Only the 64-bit version can be purchased because you cannot run 32-bit Exchange 2007 servers in production.
[b]There are two exceptions with respect to production and non-production use[/b][/u] of the 32-bit platform because Microsoft does allow minimal supported use of the 32-bit version in production environments. Specifically:
[b]You can use the 32-bit version in production[/b][/u] to administer Exchange 2007 servers from Windows Server 2003 or Windows XP. At this time, you cannot use either the 32-bit version or the 64-bit version on Windows Vista, or on Microsoft Windows Server Code Name "Longhorn". Support for Windows Vista and Windows Server Code Name "Longhorn" is expected to be delivered in Service Pack 1 for Exchange 2007.
[b]You can use the 32-bit version in production[/b][/u] to extend your Active Directory directory service schema. For detailed steps to prepare Active Directory for Exchange 2007, see How to Prepare Active Directory and Domains.
All other uses of the 32-bit version of Exchange 2007 in production environments are unsupported.
So there \*IS* a 32-bit binary available.
It \*IS* supported in limited instances.
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