Currently, I am using Thunderbird, nice light good working email reader, but for the most part, I use a mail reader on one of my servers and I don't down load the majority of mail to my computer. A good amount of my email use is on yahoo or gmail, as well as many other free email servers, I just don't have that many important emails I have to worry about these days and with yahoo, I can set up as many disposable addresses as I need. Heck the only computer that still actually has internet explorer on it, is my win 8.1 machine, I took it off my win 7 machines and on my XP pro 64 bit machine never had IE on it. I have not taken the time to see if there is a hack that I can perform on win 8 to see if I can remove it, but it is no big deal, I have never opened it up, I use FF or Palemoon for my browser..
The company I am working for is also using Outlook, so I am forced to use it, but I don't like it!