If you uninstall office before installing the new version, your Office 365 files won’t be deleted, but if your version of update office 365 includes Outlook you should back up your Outlook data files
Suggestion to Upgrade Microsoft Office Programs:
Always be sure that you are ready to update your software before you click on Update Now button,
If you are not sure to upgrading to office 365 , choose View Updates first and review your options before proceeding.
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