Cannot open meeting item from *.ics attachment

[nonsense]

I am trying to open a meeting.ics attachment with an email which works
in older outlook, but not 2007. I get this error message:

" Cannot open meeting item The operation failed. An object cannot be
found "

The meeting.ics file just has:

BEGIN:VCALENDAR
METHOD:REQUEST
BEGIN:VEVENT
DTSTART:20080915T080000
SUMMARY:Scheduling for Joe user
DTEND:20080915T083000
DESCRIPTION:Test
END:VEVENT
END:VCALENDAR