Thunderbird is quite similar to Gmail, in many aspects, especially graphically. Both do the same job in a good way. I can tell that we use Thunderbird for years already, and in general we are pretty satisfied, so there is no reason to change software to try or evaluate …
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Chose Thunderbird
We choose Thunderbird since it proved to be sufficient for our needs and is freeware. The choice was also influenced by a contact who is a certified cybercrime investigator
I like that it's free, I like that it's open-source, and the fact that it allows IMAP lets me have this on all 3 laptops and it's synced. I would never consider using it as my primary email client, however; just too clunky and can't navigate around fast enough the way I do with Gmail. And not even close to having all the features I'd need that Gmail does: 30 second undo-sending, canned responses, easy-to-create signatures for each email address (I literally toggle over to Gmail, compose a message, and paste my sig into the body of Thunderbird emails, so clunky), all spam ends up in my inbox even after I've marked enough as spam that it should know, email labeling and filtering... Gmail is just way more advanced and feature-ful. But, Thunderbird does beat my ridiculous RoundCube webmail interface!
Thunderbird is a software very simple to use, but efficient in every aspect. We don't have a specific need, apart to manage email in both directions, and Thunderbird does it's job in the best way. I would like to see a more friendly interface, with some colours more, to help the sight in the email searching. When we have many of them, sometimes it's difficult to find the one that we need.