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'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.Post Office Protocol (POP3) is an example of a polling email delivery protocol.At login and later at intervals, the mail user agent (client) polls the mail delivery agent (server) to see if there is new mail, and if so downloads it to a mailbox on the user's computer.
Apple's i Phone, i Pad and i Pod Touch support Hotmail push email.
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 Nokia asha smartphones and select models of Nseries smartphones and newer s60 and Symbian^3 handsets running symbian os 9.x or Symbian^3 support the Mail for Exchange software, which is compatible with Microsoft Exchange Server Active Sync and Direct Push, allowing the Nokia smartphones to receive push email as well as sync contact lists, calendars, and tasks with Exchange servers.
Global Address Lookup is also supported, starting with version 2 of the Mail for Exchange software.