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Click on the right panel and select Events and Tasks.Go to the Add-On section in the right panel and configure the Lightning.Download Thunderbird Lightning from the official site of Mozilla.Choose the Whole Calendar as Date Range.Enter a file name and select iCalendar format in Save as type section.Choose the File drop-down menu and highlight Save Calendar.Note: It is recommended to follow the guidelines sequentially to avoid any kind of data loss while exporting Outlook 2019, 2016, 2013, 2010 calendar. Lightning is a Mozilla Thunderbird add-on that enables users to schedule group meetings, assign the tasks and appointments. Here, we are going to use Thunderbird Lightning to import Outlook calendar to Thunderbird. Method 1: Transfer Outlook Calendar Events to Thunderbird Using ICS Format Learn How to Import PST to Thunderbird?.
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A Guide on How to Sync Outlook Calendar to Google Gmail Calendar?.
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