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They do have tabs in the office suite, for the toolbars. And there are those annoying settings windows where the tab rows swap places when you switch tab.

These aren't tabs in the sense GP means, because they don't allow you to do something with multiple documents or such.

Yes, Microsoft GUIs are riddled with tabs of the other kind.

Visual Studio (Code) have tabs as far as my hazy memory reaches back.

Onenote.