Updated to Synology DSM 6.2

• Open Calendar, then hover over your desired calendar below CALENDAR on the right
• Click the down arrow and select “CalDAV Account”
• Select the line below “Thunderbird:” and copy the url. Make sure you opened the calendar through the required protocol (HTTP or HTTPS)

• TbSync
• How to securely manage your Synology NAS calendar
• How to Sync Synology Calendar with CalDAV Clients
• Kalender auf der DiskStation
• Ports for Synology DSM