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 Outlook.com account (previously known as Hotmail accounts), then you can indeed have an additional Birthday Calendar since Outlook.com doesn’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 Outlook.com, click on the down arrow next to Outlook.com and select your Calendar from the drop-down menu. Another way to directly get to your online calendar is by visiting the Windows Live Calendar website.
In Windows Live Calendar, press the little down arrow next to the New button and select Birthday Calendar.
In the new page that opens, you can set various visual settings and notification options such as where reminders should be displayed or sent to.
Once created, the Birthday Calendar will automatically get added to Outlook again after some time (could take up to 30 minutes).