In Outlook 2013, navigate to File.
In the Outlook Options dialog box, select Calender.
Scroll to the ‘Calender Options’ section, click on Add Holidays.
The Add Holidays to Calendar dialog box springs up. Tick which countries you want holidays to add to your calendar. For our example, we chose Australia. Click OK to confirm.
A pop up box states that the requested holidays have now been added to your calendar. Click OK to continue. Click OK again to close the Options dialog box.
Navigate over to your Calendars. You can see the holiday for the Queen’s birthday that occurs in June has now appeared! Wasn’t that easy?