Comment 4 for bug 320618

I don't think this is a dup of the bugs that Pete mentioned. My colleague and I have confirmed this bug by starting from no .mozilla/sunbird directory, then adding an event, accidentally putting it on the read-only http:// web-only ics calendar. The error message is:

"There has been an error reading data for calendar: basic. It has been placed in read-only mode, since changes to this calendar will likely result in data-loss. You may change this setting by choosing 'Edit Calendar'.

Error number: 0x0
Description: Publishing the calendar file failed
Status code: 404: Not Found"

After that, the event appears on calendar until Sunbird is restarted and cannot be deleted or manipulated (e.g. moved to another calendar). When Sunbird is restarted, the event is gone (i.e. restarting Sunbird is a workaround to this bug). Once error is produced for the first time, the remote calendar will not be available when adding additional events.

We only confirmed it in version 0.7 of sunbird, BTW, as shipped with Ubuntu hardy. We filed a bug there as well: https://bugs.launchpad.net/sunbird/+bug/320618