Blue Duck

Understood, thanks for your answer.

Hello, Quite same setup here: last MS Outlook (via Microsoft 365), self-hosted Nextcloud 19 on Ubuntu 18.04, last CalDAV Synchronizer (3.8.1) and Windows 10 Professionnal. .Net 4.7 is uptodate. I have my own certification authority to sign my Nextcloud server's certificate, which CA certificate I've added to the Windows' store, so the new Edge browser does not complain about the self-signed certificate when accessing the Nextcloud web interface. Adding a new synchronization profile, I first got the...