Please close Ticket @ 2101 - The problem has been resolved. Thank you!
On May 22, 2025, downloaded CalDav, installed and configured it correctly to have Zoho Web Based Calendar duplicate to Outlook Calendar on my PC and Vice versa. This worked very nicely for about 7 days. After that any changes made to the Zoho Web Based Calendar did NOT duplicate onto Outlook Calendar on my PC. Likewise, any changes made to the Outlook Calendar on my PC no longer duplicated onto the Zoho Web Based Calendar. I have no explanation as to why this is now taking place with the Calendars....
CalDav no longer synchronizing