I wanted to add another sheet to an Excel workbook, but when I clicked on the "+" to add the additional worksheet, I saw the message "Workbook is protected and cannot be changed."
I didn't know what the password might be because I had never set a password for the workbook, which I had created in a prior version of Excel; I'm using Microsoft Office 2016 on a MacBook Pro running OS X El Capitan (10.11.6) at the moment.
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