In general, comcast will have to support POP3 E-Mail (for E-Mail that
you receive) and SMTP E-Mail (for E-Mail that you send) (there are some
other formats supported as well, but POP3 and SMTP are the most common).
Assuming that it does, you need to enter the proper parameters into
outlook (basically server names, account IDs and logon passwords). Once
you have done this, you can receive E-Mail in Outlook. Note, the mail
isn't "sent" to outlook, per se, rather you open outlook and outlook
goes to the server and asks for the mail (and receives it, if the
necessary configuration has been correctly setup).
Note also, Outlook and Outlook Express are two totally separate,
distinct and different programs and function somewhat differently
(although both are E-Mail client programs).