A user can choose to show a calendar in the Main Calendar.
In a shared calendar the owner has the ability to go to properties
of the calendar and choose the option "Show in Main
This option is greyed out for any users that have been added to the shared calendar. Rights to the calendar do not make a difference.
This issue cannot be fixed because of the current architecture
of GroupWise 7.
This issue is not a problem for the next version of GroupWise code named "Bonsai" slated for release in 2008.