We are creating several public calendars for internal and external viewing. The problem I am having concerns permissions. It seems that the "Anonymous" user account in Exchange (created and assigned "Author" permissions) is not working correctly. Here's the problem - I have created calendars and folders containing calendars in the "All Public Folders" folder and assigned permissions to the folders. I need users with valid e-mail accounts to have access as assigned to the subfolders and users without accounts to have no access to the subfolder and only view the calendars in the default public folder. On any folder, setting "Default" user to "Reviewer" and "Anonymous" user to "None" with "Folder visible" unchecked does NOT hide the folder if a browser is pointed to the url of the public folder. I can hide them by also changing the "Default" user to "None" and unchecking "Folder visible", but then I have to manually add each valid user in order for them to view the folder and contents. After I add approx 130 users, I get an error 80040305 and cannot add and change permissions for any additional users. Any ideas? Thanks in advance.