Add a birthday calendar in Outlook Whether you use a personal Microsoft account or a Microsoft 365 account (formerly known as Office 365), you'll find the option to display the birthday calendar ...

To remove Facebook birthdays from your Outlook calendar, go to Settings (gear icon) > View all Outlook settings > Calendar > View. Then, uncheck the Birthday calendar option.

To disable these notifications, launch the Outlook.com app and navigate to the Calendar app, then click the Gear icon (settings icon) and uncheck the Birthday calendar box. If you prefer to keep ...

This notification cannot be turned off in the Personal version of 365, but running Outlook in Safe Mode can stop the messages, suggesting a way to resolve this issue in the registry.