SharePoint Services 3.0 does not support the Irish and Welsh locales. This occurs
because the Irish and Welsh locales do not exist in the Rgnlstng.xms file.
To resolve this issue, apply the following update:
Description of the Windows SharePoint Services 3.0 hotfix package (Wssmui.msp): April 28, 2009
After you install this Hotfix package, you will encounter various
performance issues when you use Irish and Welsh locales on a SharePoint
deployment that is installed on Windows Server 2003.
To work around
these issues, use one of the following methods:
- Use Irish and Welsh locales on a SharePoint deployment that
is installed on Windows Server 2008.
- Use locales other than Irish and Welsh, for example
English, on a SharePoint deployment that is installed on Windows Server 2003.
Note If you use this method, the calendar, currency, date, and time
will not appear localized to Welsh or Irish standards because an alternative
locale, for example English, was selected.
has confirmed that this is a problem in the Microsoft products that are listed
in the "Applies to" section.