We have a SBS2011 server with Exchange 2010 installed. Several public folders are setup, but some users are unable to add appointments to the public calendar. When they double click on an empty field they receive a message stating that they don't have permissions to edit the calendar. I have gone through the EMC using the Public Folder Management Console and have assigned the user editor rights and still receive the same results. Is there some other method that I should be using to allow the employee to add appointments to the calendar?