Using Exchange ActiveSync from a .NET Application » CraigW Blog

Exchange ActiveSync allows over-the-air syncing termed “AirSync” and is used mainly by mobile devices. It uses HTTP POST (with or without SSL) to send/receive data (see: [MS-ASHTTP]) and constists of several commands (see: [MS-ASCMD]) which use WBXML encoded XML body content to convey data (see: [MS-ASWBXML]).