ActiveSync acts as the gateway between your Microsoft Windows-powered PC and Windows Mobile powered device and allows you to synchronize Microsoft Outlook information, Microsoft Office documents, pictures, music, videos and applications to and from your device.
In addition to synchronizing with a desktop PC, ActiveSync allows you to synchronize Microsoft Outlook information directly with Microsoft Exchange Server 2003 and Microsoft Exchange Server 2007, so that you can keep your e-mail, calendar data, tasks and contact information updated wirelessly when you’re away from your desktop or tablet PC.*