There seems to be a well known issue with the Exchange mail sync in iPhone.
At least on my iPhone the battery time is reduced by more than half when I activate the Microsoft Exchange synchronization. I'll try to find more information on this today...
Edit:
Article about the settings you need to tweak:
http://blog.fosketts.net/2008/07/21/a-few-iphone-exchange-activesync-gotchas/
Apple's Suggestions:
http://www.apple.com/au/batteries/iphone.html
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