ThunderBird from the Mozilla Stable is very good - it is frequently updated for both features and compatibility.
Thunderbird -- Reclaim your inbox "Thunderbird delivers. Enjoy safe, fast, and easy email, with intelligent spam filters, quick message search, and customizable views. Brought to you by the makers of Firefox, Thunderbird makes email better." click here
Calypso is also very good: Now known as courier
Courier Email, the safe, secure and easy-to-use email for business and home use by Rose City Software click here
was thinking offline email and news. Outlook express doesn`t allow deleting messages without opening them, (or at least I can`t see a way, and I just don`t like it. Got spoilt by being with `Demon` for a while, and using their Turnpike which I got to know how to use. Don`t think you can use Turnpike without being with Demon, or I`d get that since I know it.