KB 63
From SWCP Support Wiki
Can't disable Preview pane in Outlook Express, the option is grayed out
Article:63 Created:2000-05-23 10:50:17 Categories: Virus Information
Question or Symptom
When I go to View-->Layout, I have a Preview Pane section, but the settings are all grayed out.
Resolution
You have to actually be viewing a message in order to set these options.
Don't assume you're safe just because you don't see the "show Preview
Pane" box as being checked. If it's grayed out you have no information
about your current settings.