Login screens: Windows (left) and Mac (right)
Microsoft Office is licenced in two different ways: Once you’ve installed Office on a computer it’s available to all regular users on that machine however the licencing rules matter.
Windows 11 for Microsoft Office users and Windows 10 for Microsoft Office users both have a chapter devoted to multi-user setup and use including making a ‘Guest’ account (which Microsoft stopped providing but we show how to restore Guest to Windows 11 and 10). Most commonly, there are separate Windows or Mac logins for the computer with each user/login having their own folders for documents etc. Office can work for multiple separate users on the one computer. It depends on which type of Office you have on a Windows or Mac computer. Microsoft Office rules might let two users or more use the same copy of Office on a computer.