It depends on the edition of your Microsoft Office 365. For example Microsoft 365 plans for home is compatible with Windows 8.1 .
https://www.microsoft.com/en-us/microsoft-365/microsoft-365-and-office-resources
Office 365 and compatibility
Laurie Kerska
21
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I have a HP desktop running on windows 8.1, 64 bit. Is office 365 compatible? Will I still be able to open my old documents I have saved?
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Reza-Ameri 17,026 Reputation points
2021-03-28T14:37:25.873+00:00
1 additional answer
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Castorix31 86,966 Reputation points
2021-03-28T14:40:58.66+00:00 From microsoft-365-and-office-resources, there is :
Operating system
Windows OS: Windows 10, Windows 8.1, Windows Server 2019, Windows Server 2016