A couple of ways they can go away is the Blackberry deleting them or
Outlook being set to AutoArchive them. So I would check the AutoArchive
settings on the AutoArchive tab of Calendar Properties.

kcb7445 wrote:
I am running Office 2007 on Vista.

Please help, alot of my appointments have started deleting off my calendar.
I have been syncing with my Blackberry bold and have checked all the setting
and cant figure out why the appointments are deleting off the PC calendar
because they are still currently on the calendar in my blackberry.