Hello everybody and thank you for your help, I'm having a strange issue with Thunderbird calendar: I have a CalDav calendar (hosted at infomaniak) set up in Thunderbird. I also have that calendar on my cellphone but using infomaniak sync app and some calendar app on the phone. I realized that when I create an event on Thunderbird on my laptop with something in description field and the add some info in the description field from my cellphone then the event end up in a strange state on Thunderbird As we can see in joined image when I hover the event in the main calendar view (on the left) the event description appear correctly with its current state (first description line added from laptop and second line added from cellphone) but if I open the event by double click or in edit mode then it doesn't show correctly, the content added from the phone is not there. This problem seems linked to Thunderbird as on my phone the event appear correctly, as well as when I connect to infomaniak webmail and check how this event appears there. Do you have any idea how to investigate this further and fix it. It is a very common use case for me, doing that almost every week as I have regular event on which I add specific information in the description field during the week, sometimes from my laptop sometimes from my phone Thank you for your help