See this recent discussion about the problem:
http://groups.google.com/group/micr...ss.general/browse_frm/thread/fcd35fbfa457fd6f
For reference, here's a list of things which are known to cause this
behavior:
• Various & sundry anti-virus applications (including Norton);
• Various & sundry anti-spyware applications;
• Various & sundry third-party firewalls;
• Any/all of the above running when SP3 was installed;
• IBM Rapid Access keyboard (driver) RAKDLL.DLL;
• Nero plug-in(s);
• Windows Desktop Search is installed;
• Windows Live Mail is or had been installed;
• Disk defragmentation;
• Using Visual Basic DoCmd.SendObject command to insert emails into
Outlook Express;
• Using any number third-party applications (e.g., accounting software) to
send emails by via Outlook Express;
• MailWasher; and/or
• Programatically opening EML files while OE is closed