Calendar and Date/Time
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Open Google Calendar
Adds the Google Calendar web interface in a new Thunderbird tab. Creating and viewing events works like in a browser (Firefox, Chrome, ...)
Provider for Exchange ActiveSync
Add sync support for Exchange ActiveSync (EAS v2.5 & v14.0) accounts to TbSync
Provider for CalDAV & CardDAV
This extension is no longer needed. Thunderbird has native CalDAV and CardDAV support.
Events spanning multiple days Requires Restart
Displays multiple day events as a "spanning" event, without borders of the day-elements inside the month- and multiweek-view.
To create your own collections, you must have a Mozilla Add-ons account.