When I send meeting request from an account type servant
Exchange, to users that they do not belong to the Exchange (to Internet),
the meeting arrives in format of flat text, in place of in format
Icalendar (with buttons for accept ...) . The recipients are users of
another Exchange server.

Only he sends the citation in format icalendar, if the account than it
Send he is not exchange ( type pop3, imap ... ).

Whas is wrong?