I am using gmail through ActiveSync and ever since I upgraded my iPhone 3GS to iOS 5 I'm not getting e-mail push notifications. If I open the e-mail app then it downloads the e-mail just fine. I did not change the ActiveSync push option.
I've tested this with my Yahoo e-mail account and it works just fine.
Is anyone else having this problem?
I found the fix. Turning off "Reminders" in the Exchange setup fixes the problem.