In Microsoft Outlook 14.0.7194.5000 (Microsoft Office Home and Business 2010) I have imported several calendars like school vacations etc. which I only want to look into (read). Unfortunately sometimes I accidently create calendar items in those calendars instead of the default one (which is visible to others). Thus it would be helpful if I could add some write protection to these calendars or at least somehow prevent creating items there.
So I opened the preferences of such a calendar and removed the Create items permission.
Apparently this has no effect. I can still create items there. Any idea?