Microsoft Exchange ActiveSync technology allows for over-the-air synchronization and push email to a wide range of mobile devices, including the iPhone and iPad, Windows Phones, and Nokia devices.
NOTE: Before you can configure a mailbox to sync using the Exchange ActiveSync technology, you must activate the Exchange ActiveSync add-on. For more information, please refer to the KB article How To -- Activate Microsoft Exchange ActiveSync.
Follow these steps to enable Exchange ActiveSync for a specific mailbox:
This mailbox can now use the Exchange ActiveSync technology to sync emails, calendars, tasks, and notes.