If you have Outlook 2003 or earlier, right-click on the Calendar folder in
the Mailbox folder list in the left pane, then click Properties, then click
the AutoArchive tab. There you will find all the settings you can change to
archive your Calendar items.
If you have Outlook 2007, you first have to open your Calendar in a new
window then you'll see on the left a folder list with a Calendar folder, the
process is then exactly the same as described above.
I hope this information is of use to you.
--
James Raley
Information Assurance Security Officer
US Army