update:
I just found out that when I tick the 'Support Outlook and Outlook 2000/XP' box when accepting an invitation, the confirmation includes just me. The appointment, when opened in the Sogo-server based calendar shows '<email address hidden>' (organiser) and '<email address hidden>' (participant). This is correct.
The incorrect '<email address hidden>' attendee is no longer introduced and thus will not get any messages when the appointment is modified or deleted.
Mind you: neither party is using Outlook nor Exchange. This is a Tbird/Lightning/Sogo setup. It does narrow down the source of the issue to the generic and/or CalDAV part of the protocol I think.
update:
I just found out that when I tick the 'Support Outlook and Outlook 2000/XP' box when accepting an invitation, the confirmation includes just me. The appointment, when opened in the Sogo-server based calendar shows '<email address hidden>' (organiser) and '<email address hidden>' (participant). This is correct.
The incorrect '<email address hidden>' attendee is no longer introduced and thus will not get any messages when the appointment is modified or deleted.
Mind you: neither party is using Outlook nor Exchange. This is a Tbird/Lightning /Sogo setup. It does narrow down the source of the issue to the generic and/or CalDAV part of the protocol I think.
For now this is a workaround.
cheers
Tom