Microsoft is opening the doors to the public and letting them test ActiveSync 4.2 Beta. This is going to be the next release of ActiveSync, but it still doesn’t have WiFi synchronization in it. Microsoft had this feature in an older build of 3.x but removed it because of issues. With ActiveSync 4.x you can only sync via USB cable, Bluetooth, or infrared connection. The WiFi synchronization is one of my favorite features :( .
Here is the information from the ActiveSync 4.2 Beta homepage:
ActiveSync 4.2 Beta Preview is an early look at the latest sync software release for Windows Mobile devices. Microsoft ActiveSync provides a great synchronization experience with Windows powered PCs and Microsoft Outlook right out of the box. ActiveSync acts as the gateway between your Windows powered PC and Windows Mobile powered device, enabling the transfer of Outlook information, Office documents, pictures, music, videos and applications from your desktop to your device. In addition to synchronizing with a desktop PC, ActiveSync can synchronize directly with Microsoft Exchange Server 2003 so that you can keep your e-mail, Calendar, Notes, and Contacts updated wirelessly when you’re away from your PC.* The ActiveSync 4.2 Beta Preview delivers new features to improve the synchronization experience for customers. Support for ActiveSync Beta 2 Preview will not be available from Microsoft. Limited peer-to-peer support is available with opportunity to provide feedback from the following site: ActiveSync 4.2 Beta feedback. Because this is a beta, the ActiveSync 4.2 Beta Preview should not be used on production systems in mission-critical environments. ActiveSync 4.2 Beta Preview supports PC sync via USB cable, Bluetooth, or infrared connection.