Then, it’s an issue related to KOrganizer’s interpretation of iCalendar content – RFC 5545 and the other RFCs related to iCalendar.
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Yes, yes, I know – the Kontact components are quite strict with respect to RFC conformance but,
it would be often useful if, the strict conformance to the RFCs could be relaxed for specific issues –
such as the case in question: -
An appointment has been received with the recipient not being mentioned in iCalendar “PARTICIPANT” parameter.
You could edit the received .ics file and add yourself to the “PARTICIPANT” parameter …
In the past KMail behaved badly if received e-Mail had a badly formatted empty “From:” parameter – the colon and the suffix space were missing …
Which is sort of the same issue – possibly …
A Change Request addressed to the Kontact/KOrganiser folks could be a possible solution.