[Evolution] evolution-ews handling of recurring appointments got worse

[hardware mike franken de (Michael Hirmke)]

Hi *,

since evolution-ews-3.26.3 handling of recurring appointments got even
worse.

Before, I had problems when modifying a single appointment in a series
from evolution calendar gui. This lead to a duplicate entry:
https://bugzilla.gnome.org/show_bug.cgi?id=789899.

Since 2.6.3 *every* modification of a recurring appointment leads to a
duplicate entry, even modifications for meeting requests sent by the
original organizator. The same entry shows correctly in Outlook -
modified and without a bad brother 8-<
Even worse: Deleting the duplicate entry in evolution removes both
entries in evolution, the correct entry in outlook and sends out a
decline message to the organizator.

With this behaviour evo has become completely useless for me, because I
need calendar and meetings requests more than even email.

Does anyone have any hint?

EWS is talking to an Exchange Server 2016 CU5.

TIA.
Bye.
Michael.
-- 
Michael Hirmke