OK this seems like it should be simple. I am an Exchange 2003 admin,
all our users are running Outlook 2003.

Our building power is being shut down and I want to remind all users 2
hours prior to the event which takes place over 5 hours that they
should shut down their computers.

It isn't a "meeting" - I dont want people to "attend", or to accept or
reject anything, I just want a reminder to pop-up in their outlook at
the scheduled time. What is the best way of going about this?