iPhone battery issue - exchange calendar sync the primary suspect

I previously posted about very poor battery life and how a full re-install and reset seemed to fix the issue. The battery life was great for a week or so then I tried to go from my calendar on .me to my calendar on exchange. Then the issues re-appeared.

I am 99.9% sure that calendar sync via exchange is the issue. I am not sure if it's a funky server setting that my company has or what. It seems to work fine for others in the company however my e-mail account at work is relatively old compared to theirs. I am also on a Mac using Entourage. I made sure push was turned off and only fetch every hour. Still the same issue.

Again there is no battery drain when synching via iCal/.me. This kind of defeats the purpose of push calendar for me because I need to synch Entourage with iCal then iCal with .me. This means I need to be on my company network to sync. So the only time my calendar syncs is when I have my laptop on the company network.

The reason I'm writing is in hopes that someone from apple reads this and posts a fix. The CPU gets noticeably hot when exchange calendar sync is on so I know something is up. If you have any more info on this please let me know. I am also going to try the apple store tomorrow. Maybe it's a defective phone BUT since it works for everything except Exchange cal sync I am thinking it is some server/client polling issue.