Microsoft offers two email systems, Outlook and Outlook Express. Why?
I have used both but prefer OE, probably because I use it much more than Outlook (20:1). I cannot see any advantage of one over the other but I am a very basic user. I'm sure there must be a very good reason for two systems and a more experienced user may have the answer.

What are the pros and cons of both systems and what do the people out there run?
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Microsoft sells Outlook; it has more features than Outlook Express, which is free. Outlook Express is now obsolete, having been replaced on Windows Vista by Windows Mail.

I use Mozilla Thunderbird as my E-mail message client.