Unfortunately exactly the same issue with SabreDAV: Outlook 365 (Build 16.0.17328.20162) 64bit CalDavSynchronizer Version: 4.4.1.0 SabreDAV 4.2.1
Unfortunately exactly the same issue with SabreDAV: Outlook 365 (Build 16.0.17328.20162) 64bit CalDavSynchronizer Version: 4.4.1.0 SabreDAV 4.2.1