Office 365 has never been included as part of an Office or Windows update. Someone has downloaded and installed Office 365 on your PC. If you don't want to use Office 365, you should uninstall it. Depending on how the installation was done, Office 2010 may still be operable after that; otherwise you'll need to reinstall it.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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