Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
I was wondering the same thing. I can still turn it on but when i try to change emails from fetch to push, its not there :confused:
 
settings->Mail, Contacts,Calendar...

in there there is a on/of slider

advanced at the bottom of the page lets you do each account separately
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.