Over on Bharat's blog he posted a nice Q&A about the upcoming Exchange 2007 RTM.  He clears up some of the confusion about the launch event later this month and the 32bit version of Exchange.

http://www.exchangepedia.com/blog/2006/11/exchange-server-2007-questions-before.html

Q. When will Exchange Server 2007 go RTM?
A. December 2006, according to David Lemson's keynote at Exchange Connections earlier this month.

Q. Will 32-bit versions of Exchange Server 2007 be available?
A. Yes, but most likely won't ship on the product DVD - the 32-bit version is strictly for testing/training purposes only.

Q. Can I use the 32-bit version for production? I understand Microsoft will not support it in production.
A. NO. Not only will you be embracing unwanted risk by ensuring you don't get any support should something go wrong, but it will (most likely) be a violation of Microsoft's licensing agreement.

...

Continued at Source: