Display your default calendar in a by category view. Select the holidays category, right click and drag them to the non-default calendar folder. Release the mouse button and select Copy.

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Milly Staples [MVP - Outlook]
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After furious head scratching, Marilyn asked:
| I succeeded in adding holidays to my default calendar but can not get
| them to appear on personal calendars. If I try to add them, they are
| duplicated in the default calendar.
Marilyn - 26 Sep 2006 17:01 GMT
Thank you so much. That was quite simple and worked perfectly.
Marilyn
> Display your default calendar in a by category view. Select the holidays category, right click and drag them to the non-default calendar folder. Release the mouse button and select Copy.
>
> | I succeeded in adding holidays to my default calendar but can not get
> | them to appear on personal calendars. If I try to add them, they are
> | duplicated in the default calendar.