Download ActiveSync 4.5 from Official Microsoft Download Center

• Microsoft ActiveSync 4.5 is the latest sync software release for Windows Mobile-powered devices. ActiveSync provides a great synchronization experience with Windows®-powered PCs and Microsoft Outlook right out of the box.
  
  • Faster file transfer speed and photo sync via Outlook are only available for Windows Mobile 5.0 powered devices.
  • Remote PC Sync (via WiFi or LAN) has been removed due to Enterprise customer feedback around security issues.
  • Customers using Microsoft Exchange 2003 Service Pack 2 with devices running the Messaging and Security Feature Pack for Windows Mobile 5.0 will benefit from the following feature enhancements included in ActiveSync 4.5: Direct Push Technology, local device wipe, and certificate powered authentication to Microsoft Exchange.
  • Microsoft® Outlook® 2000 is not supported by ActiveSync 4.5. It is highly recommended that users upgrade to Microsoft® Outlook® 2003 messaging and collaboration client.
  • Conversion of database files for use on a mobile device is not supported by ActiveSync 4.5. On previous versions, this feature was limited to devices running Windows Mobile software for Pocket PC 2003 and earlier.
  • Conversion of font files for use on a mobile device is not supported by ActiveSync 4.5. On previous versions, this feature was limited to devices running Windows Mobile software for Pocket PC 2003 and earlier.
  *Connectivity and synchronization may require separately purchased equipment and/or wireless products (e.g., WiFi card, network software, server hardware, and/or redirector software). Service plans are required for Internet, WiFi and phone access. Features and performance may vary by service provider and are subject to network limitations. See device manufacturer, service provider and/or corporate IT department for details.
  
  Note: Microsoft ActiveSync works only with Windows XP SP2 or earlier. If you have Windows Vista, your synchronization settings will be managed through the Windows Mobile Device Center. Windows Mobile Device Center is available through the Windows Mobile Device Center page.

Windows Server 2003, Windows Server 2003 Service Pack 1, Windows Server 2003 Service Pack 2, Windows XP, Windows XP 64-bit, Windows XP Embedded, Windows XP Embedded Service Pack 1, Windows XP Embedded Service Pack 2 , Windows XP for Itanium-based Systems Version 2003, Windows XP Home Edition , Windows XP Media Center Edition, Windows XP Professional 64-Bit Edition (Itanium) , Windows XP Professional 64-Bit Edition (Itanium) 2003, Windows XP Professional Edition , Windows XP Professional x64 Edition , Windows XP Service Pack 1, Windows XP Service Pack 2, Windows XP Starter Edition, Windows XP Tablet PC Edition

• Supported Operating Systems:
  • Windows 2000 Service Pack 4; Windows Server 2003 Service Pack 1; Windows Server 2003 Service Pack 1 for Itanium-based Systems; Windows Server 2003, Standard x64 Edition; Windows XP Media Center Edition; Windows XP Professional x64 Edition ; Windows XP Service Pack 1; Windows XP Service Pack 2; Windows XP Tablet PC Edition
  • Microsoft® Outlook® XP, Microsoft® Outlook® 2003 or Microsoft Outlook 2007® messaging and collaboration clients required for synchronization to the desktop or portable computer of e-mail, calendar, contacts, tasks, and notes. (Outlook 2007 is recommended)
  • Microsoft® Office XP, Microsoft® Office 2003, or Microsoft® Office 2007
  • Microsoft® Internet Explorer 6. or later (required)
  • Microsoft® Systems Management Server 2.0
  
  The following mobile device operating systems are supported by ActiveSync 4.5:
  • Microsoft® Windows Mobile® 6.0
  • 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®
  • Microsoft® Smartphone 2002, Microsoft®