Quotes
"...a data synchronization service that enables mobile users to access their e-mail, calendar, and contacts and retain access to this information while they are offline."—Microsoft Tech NetMicrosoft Tech Net: Exchange Server Tech Questions
ActiveSync Background and Information
Microsoft.com: ActiveSync | Microsoft ActiveSync 4.5
Wikipedia: ActiveSync
Download.com: ActiveSync
Google News: ActiveSync
Topix.net: ActiveSync News