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Show Outlook Appointments (vcal / ics) 0.2.3 Requires Restart
An extension to show embedded Outlook calendar (vcal / ics) parts.
Thunderbird doesn't show calendar parts from Outlook appointment emails. This addon adds a button to download the embedded appointment as ICS to import it into another calendar.
About this Add-on
At some point I discovered that there are calendar appointments attached to the emails which are just not displayed by my Thunderbird.
When searching the Internet for a solution and following the bug report on mozilla (https://bugzilla.mozilla.org/show_bug.cgi?id=505024) there currently seems to be only one solution for this problem: Installing the Lightning extension.
As I am not using Lighting and am not willing to install a huge extension only to read these Outlook appointments I decided to create a lightweight extension with exactly one purpose. I hope I can help others with this extension and perhaps end a 10 year long debate on the bugtracker if Outlook is doing it wrong or whatever. At some point I just needed a solution which works.
When opening a message the content is scanned for alternative parts. This btw is the reason Thunderbird does not display the calendar entry. Normally an appointment consists of three parts: text, html and calendar which are all marked as alternatives. Therefore according to RFCs only one has to be shown and Thunderbird prefers text or html.
When found, a button "Download ICS" is shown (has to be added by customizing the bar first) and a large image is shown in the header bar of the message.
Please let me know if anything does not work for you. Create an issue on Github ( https://github.com/sebastianha/sfoa/issues ), best with an example message where you would expect an embedded appointment.