@Keet
Clipboard managers existed long before MS knew how to create one in Office :D
To be fair, Windows has actually had a built-in multiple-item clipboard as far back as version 3.1 (1992), it's just that most users don't know how to access it.
In the old days you had to use a tool called ClipBook Viewer (part of Windows) to view and manipulate the clipboard. This utility was removed for Vista (2006) and later since most users didn't need to access the clipboard outside of programs that could handle more robust clipboard managers (eg, embedded in Office rather than in the OS).
The only reason I remember the old clipboard is that I used to use it for batch file editing and other 90s era tricks.