Zimbra OpenSource issues on Calendar

[Peq]

Hi Forum.
Not sure where to put this - if not a problem as Administrator - Then please move to the right place.

I'm been using for several years Opensource edition. On on of my server my User uses Office2010 using POP3 access. I Having EVO as Calendar Sync for Outlook2010 For Zimbra 8.8.10_GA_3716.FOSS On Ubuntu 16.04.5 LTS (GNU/Linux 4.4.0-140-generic x86_64) installed on september 28

Since mid December:
When user recieves the Calendar Appointment in outlook - When accepting the Appointment - suddenly there's creating a Double event - called Copy:

Server Calender Online.PNG (5.96 KiB) Viewed 1443 times

Seeing details

Details online

Server Calender Online Detail.PNG (10.69 KiB) Viewed 1443 times

I'm actually recieving several answers - allthough its only accepted once

Respone of Jobs.PNG (8.27 KiB) Viewed 1443 times

But I can see the Outlook creates a Copy of the appointment here

Joblist - copy of calender.PNG (24.14 KiB) Viewed 1443 times

Oppening the copy - Have added this information:

Code: Select all

*** TO MAINTAIN CLOUD DATA INTEGRITY, THIS MEETING WILL BE READ-ONLY UNDER OUTLOOK ***

This have been happening since mid decem2018 - and have not a clue where to actually look here. The Evo addon have not been updated since installation 2016 - but have runned without any problems before dec.