ActiveSync 4.5 will not work for Windows Vista and above for that we need to install Windows Mobile Device Center.
The Windows Mobile Device Center enables you to set up new partnerships, synchronize content and manage music, pictures and video with Windows Mobile powered devices (Windows Mobile 2003 or later). The Windows Mobile Device Center combines an efficient business-data synchronization platform with a compelling user experience. The Windows Mobile Device Center helps you to quickly set up new partnerships, synchronize business-critical information such as e-mail, contacts and calendar appointments, easily manage your synchronization settings, and transfer business documents between your device and PC
Step 1: Connect your phone
Grab your phone and the USB cable that came with it. If you need some additional help setting up and using your new phone, see Windows Phone 6.5 basics for more information.
Step 2: Download the sync software for your computer
Choose the sync software for your computer's operating system, which you can download here:
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If you have Windows Vista or Windows 7, your sync settings will be managed through Windows Mobile Device Center.
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If you have Windows XP SP3, your sync settings will be managed through ActiveSync. Download ActiveSync 4.5 for here.
Step 3: Get Microsoft Office Outlook
To sync your phone's email, calendar, and contacts with your computer, you'll need to have Outlook installed on your computer. We recommend the latest version for the best experience. When you're ready to start syncing, see Sync Windows Phone 6.5 with my computer.
Hope this helps.
