Stimpy wrote:

It's a callender entry "New Appointment" with the "Invite Attendee"
button at top, then "Send" I see no place for Rich Text Fomat
option...? Here at home I use HTML for new email, Plain Text for
newsgroups and they work ok.

Open the Contact record of the person to whom you're trying to send the
invitation. Double-click the email address. Examine the "Internet Format"
drop-down. What does it say?
--
Brian Tillman