This happens because each Install button is associated with a unique product key that can only be installed on one PC.

If you bought multiple copies of Office and used the same Install button to install Office on multiple PCs, activation fails on the other PCs. Best practice for multiple versions of Office Select your Office version from the tabs below.

How you change the product key depends on your version of Office. This article applies to Office Home & Business, Office Professional, and individually purchased Office apps. To switch an Office install to or from Microsoft 365, see Switch your Office license. Visio Plan 2 OneNote for Mac Excel 2021 Word 2021 Outlook 2021 PowerPoint 2021 Access 2021 Project Professional 2021 Project Standard 2021 Publisher 2021 Visio Professional 2021 Visio Standard 2021 Office 2021 OneNote 2021 Excel 2021 for Mac Excel 2019 Word 2019 Outlook 2019 PowerPoint 2019 Access 2019 Project Professional 2019 Project Standard 2019 Publisher 2019 Visio Professional 2019 Visio Standard 2019 Office 2019 Excel 2019 for Mac Excel 2016 Word 2016 Outlook 2016 PowerPoint 2016 Access 2016 Project Professional 2016 Project Standard 2016 Publisher 2016 Visio Professional 2016 Visio Standard 2016 Office 2016 OneNote 2016 Excel 2016 for Mac Outlook 2016 for Mac PowerPoint 2016 for Mac Excel 2013 Word 2013 Outlook 2013 PowerPoint 2013 Access 2013 OneNote 2013 Project Professional 2013 Project Standard 2013 Publisher 2013 Visio 2013 Office 2013 More.

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