Confusion about M365 E3/A3 license to activate office and windows

Eaven HUANG 2,126 Reputation points

Dear experts,

I'm new to M365 subscription. We have O365 and as I know, we can assign a license to one user and he will be able to activate office 365 on up to 5 devices. If we upgraded to A3/E3, will he be able to upgrade one Windows operating system? while he still be able to activate that 5 O365 desktop apps if I was not wrong?

In such scenario, do we need to assign the A3/E3 license to that user or to that device? I'm totally lost here

Windows 10 Network
Windows 10 Network
Windows 10: A Microsoft operating system that runs on personal computers and tablets.Network: A group of devices that communicate either wirelessly or via a physical connection.
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