I've read that Thunderbird 127 is the last to support Windows 7. But on the Portableapps page it says that Thunderbird 128 runs on Win 7.
Thanks.
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If you're running on Windows 7, you'll need to use Thunderbird Portable 115.x: https://portableapps.com/apps/internet/thunderbird-portable-legacy-115
I updated the System Requirements to properly show Windows 10/11
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