The product ID and product key are used to confirm you are getting updates for a validly licensed copy of Windows. This information is not stored or retained after you finish using Windows Update, unless the product ID is not valid.
The information collected by Windows Update can also be used to generate aggregate statistics about which computer systems need support. Aggregate statistics help improve Windows and the updating service. To generate accurate statistics, Windows Update assigns a globally unique identifier (GUID) and stores it on your computer. The GUID provides a way to uniquely identify your computer without collecting information that can be used to identify you. The GUID is also used to record:
Microsoft does not use the information collected by Windows Update to identify you or contact you.
You can turn automatic updating on or off, change the frequency and time at which updates are installed, and choose which updates to install automatically by going to Windows Update in Control Panel.
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