I am a long-time user of Thunderbird and have relied on the calendar application extensively. I recently had to purchase a new computer and had to install updated software for everything including Thunderbird. The calendar is giving me fits... When the computer is turned off, I lose all records of previous meetings as well as all scheduled meetings in the future (as well as any scheduled recurring meetings) along with the links to the online meetings. I assume that I have a problem in my settings but I don't know where to begin... I have looked for other similar problems on line and most seem to be associated with sync-ing with other calendar applications - but I don' use other calendar applications and don't sync with any other applications.

Any help would be greatly appreciated.