I've encountered this periodically with individual business contacts -the
contact history grid shows the e-mail inbox pane. You might try closing
Outlook, deleting the "Outlook.box" file in \Documents and Settings\
UserName\Application Data\Microsoft\Forms and then restarting Outlook. The
file gets recreated and that usually fixes the problem, though on occasion
a reboot is needed. The problem does seem to recur after a while. Hope
that helps.