[saintfire]

I'd widen that to "I don't want to use outlook" which includes Linux installs but also all thunderbird windows users, I'd think.

[ascar]

Yes, as a long time Thunderbird on Windows user I second this.

[naasking]

Thunderbird is frankly the only Windows email client worth using if you do any development using email. The tools available as add-ons simply aren't so readily available for other options, especially not for free.