It is unclear what you are asking for/about.

Are you asking for a method to download the holidays for Outlook 2007?
(I have no idea - yet..)

Are you asking how to download the holidays for the year 2007 for Outlook
XP/2003?
( http://support.microsoft.com/kb/197555 )

Are you asking how to download the Calendar Printing Assistant for Outlook
2007?
( http://office.microsoft.com/en-us/downloads/CD102017981033.aspx )

There are many ways your question could be interpretted.
For all I know - you may not even be referring to Outlook...

Maybe you mean the "Windows Calendar" included in Vista?
http://www.microsoft.com/windowsvista/features/forhome/calendar.mspx

Maybe you mean something from the Microsoft Office Downloads?
(For use in making calendars for 2007 using Word/Excel..)
http://office.microsoft.com/en-us/templates/CT101425251033.aspx

Help us help you... Clear up your meaning.  =)

You need to buy a copy of Microsoft Works to get Calendar.
Mike.