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When "Push" is configured, emails arriving into the Microsoft Exchange inbox are instantly pushed to the device.
Calendar events sync both ways between Exchange and the device.
The Internet Message Access Protocol (IMAP) provides support for polling and notifications.
available through the use of 3rd Party software Chatter Email as early as 2004. The Palm Pre web OS has push email for Gmail, IMAP, and Exchange accounts. has native push mail applications on Android (still in Beta), Mediatek, Spreadtrum, MStar Semiconductor, and Qualcomm Binary Runtime Environment for Wireless.
'Direct Push' technology is an additional feature added to Microsoft Exchange 2003 with service pack 2 that adds messaging and security features.
A phone device running Windows Mobile 5 is enabled to poll the Exchange Server every 30 minutes.
To achieve push mail with email providers other than Exchange, there is a commercially available plug-in from Emansio that enables push mail with almost any public email provider, or any email server that supports IMAP IDLE.
Some Nokia Symbian S60 models support basic IMAP IDLE functionality with its built-in client. phones this functionality is broken, because connection to the mail server is closed (probably even outside the mailing application) and never restored.Push email is an email system that provides an always-on capability, in which new email is actively transferred (pushed) as it arrives by the mail delivery agent (MDA) (commonly called mail server) to the mail user agent (MUA), also called the email client.