Windows Defender sends basic information to Microsoft about software it detects, including where the software came from, ...

Windows Defender sends basic information to Microsoft about software it detects, including where the software came from, and actions that you apply or that Windows Defender applies automatically. Windows Defender also reports if the actions were successful, for example, if software could not be removed because your copy of Windows is not genuine. In some instances, personal information might unintentionally be sent to Microsoft; however, Microsoft will not use this information to identify you or contact you. With basic membership, Windows Defender does not alert you if it detects software or changes made by software that has not yet been analyzed for risks.