Two of them.
You can run Thunderbird which works quite well with windows 7 and easily sets up OR
do you happen to have Office 2003 or higher? If so, you can run Outlook which is what I use at home as well at the plant.
Give Thunderbird a shot though. My wife uses it and she was a Outlook Express used for years and like you, we switched over to windows 7 and there went Outlook Express. She has adapted to Thunderbird quite nicely.
If she can, I know you can.
You get that at Mozilla.
Here's a link:
http://www.mozilla.org/en-US/thunderbird/
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