I have to share my outlook calendar (Office 2007) with fellow employees, but
I don't want them to see my personal appointments. If I mark my appointments
as private, my fellow employees still can see the appointment as" Private
Appointment". I want that they won't be able even to see these labels
"Private Appointment". Is there a way to hide them completely?

Creating a new calendar and moving private appointments to it is not a good
solution.