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Oke , the provider is still needed?, oke. Yes ,you do need a provider to get internet and Thunderbird. Can you explain the recent situation or issue?Is there a missing /software or not installed?what account? Greetings Firefox volunteer.

Hello there

Running Thunderbird into troubleshoot mode when starting up should give you a better look into the situation of damaged or not normally placed , bad software or add ons agenda s or agenda s ain't there that appears again or that has been crashed in automatic updates to running troubleshoot mode it could find what is missing in the new installation to find the https://support.mozilla.org/en-US/kb/troubleshoot-mode-thunderbird you can click on it or use the option trouble shoot mode to solve having bad add ons installed the same answer is also for the operating system that is running on that pc of yours . Greetings Firefox volunteer.

The Provider add-on is only needed for tasks syncing. Otherwise, just add the calendar with the built-in CalDAV option (3-bar menu icon, New Account, Calendar, On the Network...). Enter your gmail address and the calendars will be autodetected.

Hello there https://addons.thunderbird.net/en-US/thunderbird/addon/dav-4-tbsync/?src=ss Greetings firefox volunteer.