Outlook 2000 Closes Itself

[Lee Saage]

From time to time, Outlook 2000, running on Windows 2000,
just closes itself. When it is restarted, it takes a good
two minutes to come up. During the time Outlook is
restarting, the hard drive is continuous activity and
generates the kind of buzzing noise that used to be
associated with Windows 95 activity.

This does not result in any error messages and things seem
to work fine once Outlook restarts. Any suggestions as to
cause or fix?

Thanks.