Alternatively you can download the latest beta version of this software.

Microsoft ActiveSync 4.2 is the latest synchronization software for Windows Mobile-based devices.

ActiveSync 4.2 is the latest sync software release for Windows Mobile powered devices. Microsoft ActiveSync provides a great synchronization experience with Windows-based PCs and Microsoft Outlook right out of the box. ActiveSync acts as the gateway between your Windows-based PC and Windows Mobile-based device, enabling the transfer of Outlook information, Office documents, pictures, music, videos and applications to and from 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 data, tasks and contact information updated wirelessly when you're away from your PC.*

Changes in ActiveSync 4.2 help resolve connectivity related issues with Microsoft Outlook, proxies, partnerships, and connectivity.

*Microsoft Outlook Improvements: Resolves issues relating to error code 85010014
*Proxy/DTPT interaction Improvements: Improved auto configuration of device Connection Manager settings when desktop has no proxy path to the internet.
*Improved Desktop Pass Thru behavior with ISA proxy failures
*Partnership improvements: Better resolution of multiple devices with the same name syncing with the same desktop
*Connectivity Improvements: Better handling of VPN clients (resolve unbinding of protocols from our RNDIS adapter). New auto detection of connectivity failure with user diagnostic alerts

ActiveSync 4.2 supports PC sync via USB cable, Bluetooth, or infrared connection.

System Requirements

*Supported Operating Systems: Microsoft Windows 2000 Service Pack 4; Microsoft Windows XP Media Center Edition; Windows Server 2003 Service Pack 1; Windows Server 2003 Service Pack 1 for Itanium powered Systems; Windows Server 2003, Datacenter Edition for 64-Bit Itanium-Based Systems; Windows XP Professional 64-Bit Edition (Itanium); Windows XP Service Pack 1; Windows XP Service Pack 2; Windows XP Tablet PC Edition
*Microsoft Outlook 2000, Microsoft Outlook XP, or Microsoft Outlook 2003 messaging and collaboration clients required for synchronization to the desktop or portable computer of e-mail, Calendar, Contacts, Tasks, and Notes. (Outlook 2003 is recommended)
*Microsoft Office 2000, Microsoft Office XP or Microsoft Office 2003
*Microsoft Internet Explorer 6.0 or later (required)
*Microsoft Systems Management Server 2.0

The following mobile device operating systems are supported by ActiveSync 4.2:

*Microsoft Windows Mobile 5.0
*Messaging and Security Feature Pack for Microsoft Windows Mobile 5.0
*Microsoft Windows Mobile 2003 Second Edition
*Microsoft Windows Mobile 2003
*Microsoft Pocket PC 2002, Microsoft Windows CE OS version 3.0
*Microsoft Smartphone 2002, Microsoft Windows CE OS version 3.0