ACCESSING CALENDAR OF ALL USER IN A DOMAIN

Hi

Ho can I configure Exchange2000 to put automaticly the read permission
on the calendar when I create a new mailbox, per default there is no
access to the calendar when you create a new mailbox.

I found a utility SETPERM that allow to change this permission but on
mailbox that are already created is there any way top do it at the
creation....

any idea
thank in advance
Lucien