I've found a small bug with exporting ical files from read-only org buffers. Create a simple buffer, e.g.:
* test1 <2012-01-12 Thu> and then hit C-x C-q to make the buffer read-only. Then do C-c C-e i to export an ical file. You get an error that the buffer is read-only. I think this is due to the call to org-refresh-category-properties, which can't update text proprties. My workaround is to do: (setq inhibit-read-only nil) so that text properties can be added to read-only buffers. This could be done locally within the ical export functions if others thought sensible, for which I can send a patch if desired. Stephen ---------------------------------------------------------------------- Emacs : GNU Emacs 23.3.1 (x86_64-pc-linux-gnu, GTK+ Version 2.24.5) of 2011-08-14 on allspice, modified by Debian Package: Org-mode version 7.8.03 (release_7.8.03.112.g8861)