[bobbenedetti]

RE: Impact of planning registry hack on Microsoft Push email.
HKEY_LOCAL_MACHINE\Comm\ConnMgr\Planner\Settings\
CacheTime
-change the decimal value from the default 600 to 60

I set this hack last night and while it has a noticeable (positive) impact on battery life the push mail continues to function properly. Messages are recieved seconds after they hit the Exchange server, the message alert bings on the phone but it does not wake up.
By contrast a text message will fully wake up the phone.
The fact that the phone does not wake up means that I am saving about 80mA for 30 seconds(the backlight) for each time a message does not wake up the phone with no feature loss.
Sounds like a no brainer to me.

YMMD

Telus 2.1 ROM