We use a single Exchange 2010 Server in our organisation with Outlook 2007 as mailclient. We now have the problem that appointments with external contact are only send as a textmail. Even the internal reciepients receive the message in textfomat so the it is not possible to accept or decline the appointment. When you only invite internal reciepients everything is OK.
It also seems that not every user is affected with this symtoms. When I use my own account I dicover no problems.
I checked if my user has any different permission or is affected by different policies, but I can not find any differences.
I also checked the Exchange Server message tracking and discoverd a difference between my account an the other accounts:
My account shows the following steps:
TRANSFER ROUTING ContentConversion
Acoounts with problems show the following steps:
I don't now why the Exchange Server handles the messages in a different way. Does anybody now what I can do to solve this problem?