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The Unlicensed Product Microsoft Office Error is common in all versions of office like Microsoft 365, Office 2021,Office 2019, Office 2016. To use the core applications in any edition, you need to activate the proper method for each edition. When you open Microsoft Word, Excel, Outlook or PowerPoint , you will see a message that says: “Unlicensed Microsoft Office.”


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Microsoft Office Unlicensed Product Error Message
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Microsoft Office Unlicensed Product Error Message

"Unlicensed Product Error" refers to where a software application or product is being used without valid license. I suggest you to refer this