Updating holidays in outlook
To add current holidays to Outlook 2007, 2003, or 2002, users will need to download an updated holiday file.
I have a HOL file for Outlook 2007, 2003, 2002 at Outlook Tips.
This list is identical to the Outlook 2010 holidays (and to the Outlook-Tips file) and contains dates though 2020/2028.
Unfortunatly, it does a version check and only works with Outlook 2007 SP2 or SP3.
As reported in official Microsoft blog, some holidays are listed incorrectly in the Microsoft Outlook Holiday file including the wrong dates for Whit Sunday and Whit Monday.
The updated list released lately corrects the incorrect holiday dates mentioned in the previous versions of the holiday file.
It holds corrections over the one that is currently included with an up-to-date Office 2007 and Office 2010 installation.
An updated holiday list is available from Outlook Tips.
Microsoft Outlook 2007's holiday list included dates through 2012.
This is because the holiday file was only named starting with Outlook 2002; previous versions use
Microsoft today released an updated holiday list for Outlook 2010.