sharing someone else's calendar with public and private appointments within Exchange 2003?

Is there a way to share someone else's calendar using Exchange 2003 and allow that user to have private appointments? (i.e. some events would be public, viewable by all users who have access to the calendar and some would be private, others would not be able to see these appointments)

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You can use public folder to create a calendar that need to share information with other users and set permission, so that users can edit only items they post, view only...check the calendar property...permission and you can see the various options. Otherwise if you want to keep the calendar in the user mailbox you will have to set the permission on in outlook or can be done on exchange also but it's easier to set the permission in outlook so the mailbox owner has controle on user permissions.
If you grant permission to the mailbox, then those with permissions can see everything.
However if the primary user wants to hide some appointments, then they need to enable the "Private" option which is in the lower right corner of each appointment. The time will still show as busy, but the details will not be visible. That will apply to anyone who has permissions on the mailbox.

I was going to suggest the primary user create a new calendar for the private appointments.  M$ help warns that the private checkbox does not offer very much security.
So if the risk is low use private checkbox, if it is a big deal and you are working on a fairly complicated schedule sharing technique, you might want to bite the bullet and create calendars that are not shared, educate the primary users how to view them both at the same time by checking both boxes (OLK 2003)

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