OWA: meeting request e-mails with no Buttons

Outlook web access 2003, XP pro, IE 6 upgraded

When sending a meeting request, on the receiving end it should prompt to accept, decline, etc.

When I try to send a meeting request, userA does not get those options. They receive the email in the following format:

when..
where..
*~*~*~*~*~*~*~*~*~*

This happens only when someone from a certain domain sends to userA. UserA gets these meeting requests fine in normal format from users in the same domain. Other users don’t have the problem.

Any insight appreciated for you Office pros