I know I mentioned it on a previous post, yet I really had to call this out indivdually as it is an important landmark and really shows our commitment to 64 bit. We will be shipping one of the most important applicaiton to microsoft and the industry as email is the core of electroic communications in 64-bit mode only. As Stuart J. Johnston states in his article at redmondmag.com "this is fairly significant for Exchange, and incredibly significant for the market."
You can check it out @ http://redmondmag.com/news/article.asp?editorialsid=7046
Having an x64 version shows commitment. Not having an x32 version is product suicide. Ok, maybe I’m exaggerating, but it will most certainly slow product adoption.
Thanks for your comments and I agree that it might slow adoption. Especially if there is no simple migration, yet from an Infrastructure perspective the adoption of x64 is really important and we need a level of leadership to increase awareness. X64 does have some real benefits that can help organizations reduce their costs and help with server consolidation. Announcing a product release in this fashion really gets managers thinking about the technology. It hard to see the benefits from a pure OS platform perspective, but when you see the performance of x64 with a key application like email… you can clearly see the value. Another one of my colleagues Eileen Brown blogged about the product development cycle and how it may help us get to that conclusion “I also understand that during the betas, there will be both a 32 bit and 64 bit version of Exchange 12 so you can compare the performance gains. The other useful thing is that when you're upgrading to 64bit Exchange 12 you won't need to upgrade your global catalog servers to 64 bit as well. It's a good idea to do the upgrade though and take advantage of the massive IO reduction. And as E12 will support mixed 32 bit and 64 bit environments including legacy Exchange 2003 and Exchange 2000 servers. You can also connect to either 32 bit or 64-bit Outlook.”
You can check out her blog @ http://blogs.technet.com/eileen_brown/archive/2005/11/15/e12_64bit_only.aspx