Office 365 (Outlook 2016 for Windows) - Adding/Removing Holidays to the Calendar

1. Click File -> Options -> Calendar
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2. Click on Add Holidays... button
3. Select using the checkbox the Country/Countries you want the Holidays added to the calendar and click OK
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4. Get a Confirmation window adding the Holidays
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Removing Holidays

1. If you want to remove all holidays from Outlook calendar, Please click View > Change View > List
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2. Please click View > Categories to sort calendar items by category
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3. You will now notice that their is a Holidays section.
   
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4. Simply Right Click on the Holidays tab and select Delete
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5. You will get a warning message. Press okay
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6. Holidays are no longer a part of your calendar.
   

Removing Certain Holidays

1. Click on the Calendar at the top View -> Change View -> List
2. Select the Holiday on the List then right click on the event and select Delete or hit the Delete button on the keyboard
1. Note: You can delete multiple events by holding down the Ctrl button on the keyboard
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