I'm having an issue with alarms on a shared calendar. I first though it was a lightning bug so I reported here: https://bugzilla.mozilla.org/show_bug.cgi?id=1171487 but it seems to be in fact a problem in the caldav server.

I'm using Thunderbird 31.7.0 with latest Integrator and Connector (31.0.1). The client is running Windows 7 pro x64 or Linux, with the same result.

I'm user A, and I have full RW access on user's B calendar. I've subscribed to user's B calendar in Thunderbird (using the integrator buttons). On this calendar, I've untick the "Show alarms" box, and this settings is propagated on SOGo (visible on the web interface).

Now, the issue I have:

• As user A on my Thunderbird, I create a event on B's calendar
• I set an alarm for this event, lets say 15 minutes before the event (the value doesn't matter)
• I save the event
• The alarm isn't set (the little bell icon is absent)
• If I re-edit the event, there's no alarm set

The problem doesn't exists on the web interface, I can create events with an alarm on shared calendar even if I don't display the alarm.

On Thunderbird, if I tick the "Show alarm" box, the problem goes away.

According to https://bugzilla.mozilla.org/show_bug.cgi?id=1171487 lightning is doing it's job: it send an event with VALARM set, and the server modify it right away, removing the VALARM