You can easily add national holidays to your calendar in Outlook to make sure that you don’t forget those extra days when you don’t need to go to work.
Before you do though, it is worth noting that Microsoft have published a whole bunch of wrong holiday dates in Outlook 2010 for at least 23 countries, including many future UK Bank Holidays. You should probably read my other post about the errors and download one or more of the files with corrections for them before you go ahead and add anything.
This article is intended to help you add national holidays, remove holidays with an incorrect date, and use Outlook categories to make these stand out on your calendar. Although I wrote this to accompany my post about incorrect dates in 2010 to show you how to actually add or remove these from your calendar, what follows applies pretty much the same to Outlook 2007 and older as well, although to be fair I have not attempted to test this in any step-by-step fashion for Outlook 2003, 2000, 97 or older as I no longer have these antiquated, steam-driven versions installed for me to access.
Adding Holidays to your Outlook 2010 Calendar
The normal way to add these holidays from the outlook.txt or outlook.hol file already installed on your machine is through Outlook’s own options as follows:
In Outlook 2010 go to File > Options then click the Calendar tab on the left, then click then “Add Holidays” button and carry on as described below.

If you are still using an older version, then for Outlook versions up to 2007, go to Tools > Options, then on the Preferences tab click on the “Calendar Options” button, then click on the “Add Holidays” button in the middle of the dialogue box which appears.
Read on to find out more about adding and removing holidays from your Outlook calendar»