hello when sending an invitation to a person within a specific company, the recepient get the invitation as a plain text email with attached ICS file that contains the invitation. both sides are using outlook 2007, and exchange 2003. this only happens with this specific company, all other invitation sent are being received normaly (as a calander objects). i've looked into the spam filer, mail relay logs, and found nothing. is there any exchange settings that can cause such error? Thanks!