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Gmail app for iOS finally gets push notifications, persistent logins
Google has now (finally!) updated its iOS Gmail application to add push support, which simply means that you get full message excerpts notifying you about new and unread email in real time. The new Gmail app updates appear directly in your Notification Center. Also, you get banners, alerts and lock screen notifications when you get new mail.
Google has also fixed the login process, so you don’t have to type in your credentials every once in a while, when your session expires, but instead you get to be persistently logged in.
source: Gmail via TheVerge