However, Office Insiders receive weekly updates, which could be subject to bugs.
Note: Anyone can enroll in the Office Insider program. Starting with version 1907 for Office Insiders, the Outlook team has extended the black theme so it now incorporates the message body and the composition panes. Similarly, when you compose an email the message body is also in white. The screenshot below is an example of how the black theme changes certain aspects such as the folder view and toolbars to black but leaves the email preview pane in white. Some aspects of the black theme were still fully illuminated, such as when you read or composed a message. However, unlike Outlook Web App, or, Microsoft Teams, the black theme was not a true dark mode. The black theme has been around in Outlook for Windows for some time.
