How to turn on WhatsApp's dark mode color scheme on a computer or mobile device

You can enable WhatsApp's dark mode on the Android, iOS, and Windows app, as well as on WhatsApp's web browser client.

How to turn on dark mode in Microsoft Outlook to change your display and reduce eye strain

To turn on dark mode in Outlook, click the File tab, choose Office Account, and set the Office Theme to black.
Windows Report

The classic Run Dialog on Windows 11 finally gets dark mode with KB5067103 update

The classic Run utility finally gets dark mode with Windows 11 KB5067103 update in Beta and Dev Insiders channel.

Microsoft makes it official: Dark mode is getting a major (and sorely needed) upgrade on Windows 11

Dark mode is finally coming to more areas of the OS on Windows 11, including legacy interfaces like the File Explorer and more, Microsoft confirms.