Dear All, I use a messaging connection between a client OWA on Windows Vista and a server MS Exchange 2000. When I send from another client (Outlook 2003) an invitation for a meeting and I want to reply to this invitation from the client OWA with Windows Vista environment and I open the invitation, I receive an error that the certificate is invalid or not recognize. In more, when I want to reply to the invitation, the message cannot be sent and stand to Draft directory. If I do the same with a Windows XP Professional PC with my client OWA, it runs well. Why ? P.S. : I tried to low the Windows Vista security and add the certificate authority in the trusted site of my Internet Browser, the problem stays the same. Thanks for your support, Job
