Microsoft allows the downgrade of any product to any prior version of the same product as per
Microsoft Product Downgrade rights, page 5. If you're using Office 365/Office 2016, you can downgrade to
Office 2010 but not Office 2010 Professional. To do so, simply uninstall
Office 365/Office 2016 and install Office 2010. To uninstall Office 2016, follow the steps indicated on this
link. To install Office 2010, kindly follow the steps indicated on this
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Last updated July 15, 2020