how do I delete all calender appointments?

How do I or is it possible to delete all the appointments in my BB calender all in one swipe?

Connect your BlackBerry to your computer.
Start up BlackBerry Desktop Manager.
Click on Backup/Restore.
Click on Advanced ...
Select the Calendar in the pane and click Delete (or Clear).

thanks seemed to work

Another way without using DM is to pull up a calendar on your blackberry, hit the menu button, then the "Select Calendar" option. Then the list of calendars (one for each email account) is displayed, type "rset" (without the quote marks). It will prompt you, asking if you want to delete the contents of one calendar at a time. Deleting all of them will clear all entries.

Posted from my CrackBerry at wapforums.crackberry.com

Ok, I deleted all my appointments on my phone. I go and hit sync to get my google calendar to update with all my appointments and when it is done it only puts partial listings not all? any suggestions?