How to restrict access to Calendar only through OWA

Hi All,

I need to give read-only access to User-A's Calendar only through OWA to User-B . User-B should not be able to access any other folders (such as Inbox or other mail folders) in User A's mailbox through OWA.

Until I give Full Mailbox Access rights to User-B through ADUC, User-B can not access  User-A's  mailbox through OWA. Now how do you restrict access to individual folders?

We are using Exchamnge 2003 (Standrad). How do I do the above?
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Take away full mailbox access and give the user direct permissions on the Calendar, then they can use
To access the Calendar directly

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