I think Outlook and Thunderbird email clients are the best, because i tried before some non traditional email clients and most of my emails were delivered to spam boxes. This is because emails spammers used those clients upto that extent that web-mail servers recognized them as a spammer. Or could be the reason that those clients were not so recognized. So be careful selecting a new E-mail client.

Thunderbird is a good email client on the cheap, otherwise I'd take Postbox over Incredimail any day, although I haven't seen anything come close to Incredimail as far as creating graphically rich emails.

Hey i have been using mozilla thunderbird. it is really good and fast and with so good graphics in the latest version it is just fun to check your email.
believe me this is the best email client on planet.......!!!

I had used Outlook Express for so long but for few days been using Mozilla Thunderbird seriously it has been great the auto-login system is one of unique feature i ever seen

I vote for Thunderbird.
Thunderbird is a solid email application that sports the same extensibility of its code-sibling Firefox. Many readers voted for not just Thunderbird but Thunderbird with the addition of Lightning, a Thunderbird extension that adds scheduling and task management functionality to Thunderbird.