Alicia Rittenhouse wrote:

I received a meeting request from another user of 2003 Outlook and
when it came through it was in plain text format.

Did that person send it in plain text or in Rich Text? If they sent it in
the latter format but you received it as plain text, have that person check
your Internet Mail settings in your contact record. Have him or her open
your contact record and double-click your email address. At the bottom of
the "E-mail Properties" dialogue you get should be an "Internet format"
drop-down that should be set to "Let Outlook decide the best sending
format".
--
Brian Tillman