Microsoft Exchange ActiveSync - overview, ordering and implementing

Microsoft Exchange ActiveSync allows you to synchronize your email, contacts, tasks and calendars between email servers and your mobile devices. ActiveSync uses direct push technology so updates are synced with your mobile devices in real time.
Implementing ActiveSync is a two step process: purchasing an ActiveSync license, then assigning the license to a specific email user (one ActiveSync license is required for each email user).
To get started, log in to Control Panel, and go to: Email Management > ActiveSync. Under the domain name you wish to purchase licenses for, click the "Order Additional Licenses" link.
Once the ActiveSync licenses are purchased, go back to Email Management > ActiveSync to select the email users that will use the ActiveSync licenses. An ActiveSync license can be applied to any email account in your account.