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Thunderbird releases 115 'Supernova', with an overhaul to their design and functionality
(blog.thunderbird.net)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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Works OK when using the paid (small yearly sub) Owl plugin. But I can't see my colleagues shared calendar, which means I'll have to stop using it in favour of either Outlook or eM Client.