I'll be its less than you think. For example, Exchange is moving to a 64 bit only version and MS has already said that Windows Server 2008 is the last 32 bit OS Microsoft will produce. 32 bit compatability will not be there for long, IMO.
>I am willing to bet that they will maintain a 32 bit "compatibility mode" for many years still.
Craig Berntson
MCSD, Microsoft .Net MVP, Grape City Community Influencer