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Sorry I meant to say that the only option is to uninstall Office365
Is this an issue with specific spreadsheets, or is it all spreadsheets?
I have one file that I opened on the machine with the problematic Excel, that file back on my machine is still giving me problems.
It seems like it is dirtying all Excel files.
I would suggest quarrantining that file, and if there isn't a repair option for Excel, then remove and re-install Excel, and don't open that spreadsheet.