While I suppose it can be done better, I'll give you my example why. I switched my MUA to Evolution because using Mozilla Classic + Mozilla Mail, I found that if I hit a web page that crashed or locked the browser, I lost my mail session.
This can be bad if you've just sunk an hour into crafting a very sensitive corporate-type email.
FWIW, I just tried the Mozilla combo again about a week ago, and still I find that the broswer crashes during ordinary broswing, and I still lose my mail session.
I like mozilla, and I like mozilla mail. But until they are both absolutely crash-proof, I think I will prefer separate apps. Sharing libraries is one thing, but I don't like to lose email sessions like that.
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