- Windows was originally named "Interface Manager" before being changed to "Windows" prior to its launch in 1985.
- Early versions of Windows (1.0, 2.0, and 3.x) operated on top of MS-DOS and required users to boot into MS-DOS before launching the graphical interface.
- The Briefcase folder was an early tool for synchronizing files between computers, which became obsolete with the rise of cloud storage solutions.
- Prior to Windows XP, user profiles were basic and lacked robust security; full user accounts were implemented with Windows NT.
- Several applications from Windows 1.0, including Calculator, Paint, Notepad, Clock, and Control Panel, are still present in Windows 11 in modernized forms.
- The "Format" dialog in File Explorer has used the same code for over 30 years, although updates for FAT32 support are being developed.
- TrueType fonts were introduced in Windows 3.1 in 1992 through a licensing agreement with Apple, improving font rendering quality.
- The "Ctrl + Alt + Delete" shortcut was created by IBM engineer David Bradley as a debugging tool and later adopted by Microsoft for secure attention sequences in Windows NT.
- Windows 1.0 required a minimum of 256KB of RAM at its launch in 1985, while Windows 11 requires at least 4GB.