Select the Gmail account to import PST file.Now, launch GAMMO application and enter the email address of your Gmail account.Note: Microsoft Outlook installation is necessary to import Outlook calendar to Thunderbird. Download and install GAMMO tool on your computer.Browse a location to save the resultant file and name it.Select Outlook Data File (.pst) option and click on Next button.Click on File tab and select Open & Export > Import/ Export.Go through the following set of instructions to attempt the procedure to transfer Outlook calendar file to Thunderbird: Step 1. Click OK to add Outlook Calendar events to Thunderbird.Īfter this, all the calendar items will be imported into Mozilla Thunderbird Method 2: Export Outlook Calendar to Thunderbird Using GAMMO Tool.Click on Browse button and select the iCalendar file that you have exported from Outlook.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?.A Guide on How to Sync Outlook Calendar to Google Gmail Calendar?.

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