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I run activesync against my Exchange 2007 server all day and still have about 60% at the end of the day. It's not great, but its not that bad either. If I am in a lower signal area, that number does drop since battery drainage is greater when the signal is low.
One thing to make sure is that if you are running your own exchange server, make sure your port 443 (SSL) isn't set to timeout too quickly. If it does, your battery will drain faster and your push mail can be delayed.
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