With 60-65% of the market still running on Exchange 2003, and it being in extended support, we are already seeing clients opting to skip 2007 and chomping at the bit for 2010.

Normally I would agree with you, on the revolutionairy phase of a product, i.e. 5.5-->2000 or 2003-->2007 but this is more of a evolutionairy phase, i.e. 2000-->2003. I was appart of a +10,000 environment, and we went quite quickly from 2000-->2003, many things fixed, very few processes changed, I suspect the same for 2007->2010 environments too.

Aging hardware and canceled projects due to recession, and timing of the release of 2010... next year will be a very busy year of people skipping 2007 and going to 2010 and I've already got clients on 2007 chomping at the bit to get to 2010.

Granted I'm not dealing with +4000 user evironments, more SMB's, but I know of a few large organizations that are looking at waiting, to many things fixed in 2010. While Beta1 is receiving rave reviews, I did find it buggy and inconsistant, contrary to the hype that's out there, so I'm very much looking forward to the next beta or RC, which should be Aug/Sept to see how much it will really be improved.