Apparently, somehow at some point I’ve deleted the Birthday Calendar from Outlook.
How do I get it back?
Actually, Outlook itself doesn’t have a Birthday Calendar as birthdays are automatically placed in your main Calendar when you enter this information for a contact.
However, when you are using an Office 365 Exchange Online, Outlook.com or Exchange 2016/2019 account, then you can indeed have an additional Birthday Calendar since web versions of Outlook don’t place birthdays for contacts in the main Calendar folder but in a separate Birthday Calendar folder.
While getting rid of this calendar is as easy as selecting it in Outlook and pressing Delete, recreating it is a bit harder, but not by much.
Recreate the Birthday Calendar online
The easiest way to recreate your Birthday Calendar folder is by logging on to the website of your Office 365 Exchange Online, Outlook.com or Outlook on the Web (OWA) mailbox provided by your company. Once logged on, select your Calendar.
Once you are in your Calendar, press the “Add calendar” button at the top and choose: Birthday calendar.
After you created the Birthday Calendar, it will automatically get added to Outlook on the desktop again after a few minutes or once you restart Outlook.
Outlook on the Web Beta interface
Unfortunately, you can’t recreate the Birthday Calendar yet in the Outlook on the Web Beta interface. When you are using that, click on the “Outlook beta” toggle in the top-right corner to switch back to the current interface.
In the new interface, the Birthday Calendar feature will most likely be added to the dialog that you get when you click on the “Discover calendars” link in the Calendar’s Navigation Pane.