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To add holidays to your Outlook calendar, you'll need to use the "Add Holidays" feature within Outlook. This feature allows you to import holidays from a list of countries into your calendar. 
Steps to Add Holidays to Outlook Calendar: 
  • Select Calendar: In the "Outlook Options" window, click on the "Calendar" option on the left. 
  • Add Holidays: Scroll down and find the "Calendar Options" section. Click on "Add Holidays" (or a similar option). 
  • Choose Countries: A dialog window will appear with a list of countries/regions. Select the countries/regions whose holidays you want to add to your calendar. 
  • Confirm: Click "OK" to import the selected holidays. 
  • Check your calendar: Close and reopen your Outlook calendar to ensure the holidays have been added. 
  1. Open Outlook: Launch your Outlook program on your Windows computer. 
  2. Go to Options: Click on "File" at the top left, then select "Options" from the menu on the left (or "Outlook Options" in older versions).