Microsoft 365 and Office | OneDrive | For home | Windows
A Microsoft file hosting and synchronization service.
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Microsoft is billing me $9.99 per month but does not list what the charge is for.
Judging by the information at https://www.microsoft.com/en-us/microsoft-365/buy/compare-all-microsoft-365-products , my guess is that you have Microsoft 365 Personal.
However, your account at https://account.microsoft.com/services should tell you exactly what you are paying for.