From your headers: "Microsoft Outlook Express 6.00.2900.2180"

Check in at Windows Update and install all critical updates offered, reboot
and then see if the behavior has changed at all.
--
~Robear Dyer (PA Bear)
MS MVP-Windows (IE/OE, Shell/User, Security), Aumha.org VSOP, DTS-L.org

Paul Gibson wrote:
When I open Outlook or Outlook Express 6 I lose my mail account passwords,
and have to reset them.

Any ideas?