Well, we have a resolution. As it turns out, a configuration change had
uninstalled the modem. Upgrading the driver for the modem (which I needed to
do anyway) reinstalled it, and I can use the automatic dialer within Outlook
once again.
I'm still curious about article #299456 in the KB, which seems to say that
the automatic dialer SHOULD NOT work when used with Windows 2000 or Windows
XP, and Outlook 2000 or Outlook XP.
New information gleaned - Office 2000 and 2002 has no automatic dialer. It
comes from the operating system, and is officially supported by the
operating system support group.
Mathew Laughlin