It's right in there in help | read me.
See
http://support.microsoft.com/default.aspx?scid=KB;en-us;q291387
Note that this is a Windows 2000 group. You will probably get a faster and
more expert answer if you post OE questions to an
Outlook Express news group.
Try posting in one of these newsgroups:
microsoft.public.windows.inetexplorer.ie5.outlookexpress for OE 5.x
microsoft.public.windows.inetexplorer.ie55.outlookexpress for OE 5.5x
microsoft.public.windows.inetexplorer.ie6_outlookexpress for OE 6.x
microsoft.public.internet.outlookexpress.mac for OE for Macintosh
If those groups aren't carried on the news server that's carrying this group
try using msnews.microsoft.com (MS's public news server that's the source
for all the microsoft.public newsgroups).
A good website for information on OE is:
http://www.tomsterdam.com/