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I sadly have to agree. The damned thing struggles with a handful of basic stuff, it still has a config UI of which you can't tell head from tail, complete with teeth and whiskers and even a full "about:config" panel à la Firefox hidden underneath. Spell checker. Calendar. Chat client. Complete web-browser internals, with grindy disk-caching. To add insult to injury, the macOS bundle is half a fxxxing GiB in size (universal flavor, but still).
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What do you use now?
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This is downvoted but needs to be said. Thunderbird was an amazing 90's style piece of software that has unfortunately been been changed into a more "modern" look, with excessive white space and power-user hostile work flows.

It was near perfect, just needed better search, pretty much.

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I liked the old style, too. Nevertheless there is View → Density → Compact / Default / Relaxed.
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Exactly. It used to be good and they're making it worse every day.
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“90s style” seems to be a compliment in some posts and a negative in others.

Very likely user’s age perspective.

It’s absolutely correct though.

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What did you switch to?
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