FYI: Unlike Exchange 2007, Exchange 2010 will *not* ship a 32-bit version
The Exchange team announced that Exchange 2010 will not have a 32-bit version – not even for evaluations. The post focuses on mainly the non-developer related impact of this change. The key points for developers are:
> Applications that automate Exchange cmdlets locally will need to be compiled for 64-bit.
> 32-bit or 64-bit applications could leverage the remote Powershell capabilities in Powershell 2.0 to invoke the Exchange cmdlets remotely.