It's a spammer's wet dream for an email client. Not to mention great fun for all those people who write mass mailing email worms.
Try something like Mozilla Thunderbird as a replacement. And if you're using IE, grab a copy of Firefox while you're at it. Your risk of spyware, spam, and other undesirable things will drop to almost nothing as soon as you stop using IE/OE.
I downloaded the 10 critical updates released by Microsoft yesterday and installed them. Afterwards none of my email links in Outlook Express worked.
The pointer hand locked up when I clicked a link and Outlook Express quit Responding. I did a System Restore and the problem went away.
What's up with that? Downloads from the Windows Update site shouldn't trash my OE!