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Windows 11 is now an ad platform--this is why we're here
(www.ghacks.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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Why Thunderbird
Because it works well
What about round cube?
It is cross platform. Users can try it, regardless of the OS and do not have to switch behavior when switching the OS.
I've been using Thunderbird for years and it's great as an Outlook substitute.