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After you import the Microsoft Office Outlook 2007 holiday (.hol) file released on August 28, 2012, you notice that some holidays are listed incorrectly. Additionally, the .hol file that is included with Microsoft Outlook 2010 lists the same incorrect dates.
Here is an example of two holidays which are displayed incorrectly.
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To work around this issue, edit the .hol file. In the examples in this section, the Whit Monday and Whit Sunday holidays are corrected in the .hol file.
Method 1: Before importing the .hol for the first time
Method 2: After importing the .hol file that has incorrect holidaysThis method can be used if you already imported the .hol file in your Outlook.
Step 1: Delete the incorrect holidays and events
Follow these steps to delete the holidays and events that are not showed correctly in your calendar. You can also use the following steps to delete any duplicate holidays that were added while you were adding holidays to your calendar.
To quickly delete all the holidays for a country/region, click the Location column heading to sort the list of events so that it displays all the holidays for a country/region together.
Step 2: Create custom holiday and event files
Create your own custom holiday set to replace the Holidays that you deleted in step 1.
The next time that you run Outlook, you can import the changed holiday file for 2015.
For more information about language codes, view the following Microsoft TechNet article:
Appendix F - Country/Region and Language Codes
For more information about how to add or delete holidays and custom events in your calendar, visit the following Microsoft web site:
Add or delete holidays and custom events in your calendar