I use Outlook Express 6 on Win XP SP3. Periodically (once or twice a day) when I have one or more messages selected and go to the Norton AntiSpam button in the toolbar, I find both This is Spam and This is not Spam greyed out. I've found that if I close Outlook Express and immediately reopen it, these items are no longer greyed out, and they work normally. Why does this happen?