This is a known bug in an OE update. It's a copy of your address
book. MS is aware of it and I'm sure it will be addressed in an
update soon.
Note - for OE questions, you will probably get a faster and more
expert answer if you post this 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/