This Microsoft site serves as a starting point for exploring Internet Explorer and Outlook Express communities. I have contributed several articles on Outlook Express there.
http://www.microsoft.com/windows/ie/community/default.mspx
By far the best place to request technical support for Outlook Express, or for any Microsoft product, is MSnews, the Microsoft public news server. Many ISPs mirror some of the groups on this server, but I recommend that you connect directly to the source. You will find over a thousand groups dedicated to all MS products. Most groups retain messages for 90 days, far longer than most ISP's news servers. As you can see from the list, there are several groups specifically for Outlook Express.
If you are unable to access newsgroups in OE, you can also access them in your web browser via the Microsoft Discussion Groups web site. When the message list appears, click the plus sign (+) at the left of a message to see the entire conversation.