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Migrate Outlook Calendar to Thunderbird

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I am attempting to migrate my Outlook Calendar to Thunderbird, but import fails with "No importable items found in the file". Here is some additional information.

- OS is Windows 10 - I am using the Outlook Client, part of Microsoft 365 Enterprise. I am no longer with my company, and so my Office 365 license has expired (hence the reason I am moving to Thunderbird). - I have already migrated my emails, using MailStore as an intermediary - Outlook Client will only export my calendar items in ".pst" file format (exporting as .ics is not an option) - I attempt to import the ".pst" file into Thunderbird (import from a file, import calendars) - the file open dialog defaults to ".ics", but I am able to change it to All files, then select the ".pst" file I created from Outlook - Thunderbird Import displays the message "No importable items found in the file" - I am a new user and am using the most recent version of Thunderbird, v128

I'm hoping somebody can provide assistance on how this can be accomplished.

Thanks, Sam

I am attempting to migrate my Outlook Calendar to Thunderbird, but import fails with "No importable items found in the file". Here is some additional information. - OS is Windows 10 - I am using the Outlook Client, part of Microsoft 365 Enterprise. I am no longer with my company, and so my Office 365 license has expired (hence the reason I am moving to Thunderbird). - I have already migrated my emails, using MailStore as an intermediary - Outlook Client will only export my calendar items in ".pst" file format (exporting as .ics is not an option) - I attempt to import the ".pst" file into Thunderbird (import from a file, import calendars) - the file open dialog defaults to ".ics", but I am able to change it to All files, then select the ".pst" file I created from Outlook - Thunderbird Import displays the message "No importable items found in the file" - I am a new user and am using the most recent version of Thunderbird, v128 I'm hoping somebody can provide assistance on how this can be accomplished. Thanks, Sam

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