Hello, I have a very strange problem in Outlook 2007 with Exchange 2003. I have created a public calendar in the public folder store. - When I create an appointment it looks like ok. But when I open the appointment Outlook say that it is unable to open the message. - When I make an appoitment from Outlook 2003 there is no problem. - When I open the appointment which I have created in Outlook 2007 with OWA I have the same problem. The appointment can't be opened. Can anyone help me? Kind regards, Dirk

Can the issue be reproduced by all users with outlook 2007 clients? Can the outlook 2003 open the appointment that created by outlook 2007? Does the issue only happen when outlook 2007 creates the appointment items in the public folder? How about other types of items? What’s the exact error info about unable to open the message? Is there any related event in the application log on the problematic client or server?James Luo TechNet Subscriber Support (http://technet.microsoft.com/en-us/subscriptions/ms788697.aspx) If you have any feedback on our support, please contact tngfb@microsoft.com