We have tried to reproduce this issue at our end but are facing some issues installing the application as a windows service. Could you please share your sample application with us that we can try to install at our end for assisting you further? I would further request you to please share the steps you are carrying out to run the service at your end.
It seems that issue is related to the Service Account Permission. Can you please let us know what kind of permissions required to create object of IEWSClient.
We used ServiceAccount.LocalSystem account I.e NT AUTHORITY\SYSTEM.
There is no such information about limitations on IEWSClient for the required permissions as we have tested this as normal application on Server 2003 a number of times. Please share your sample application with us for our further investigation and assistance. We’ll analyze it and share with our product team for further investigation into this issue.
We have logged this issue as EMAILNET-35154 in our issue tracking system fro further investigation by our Product team. We’ll update you here once there is some information available in this regard.
The issue has been logged too recently and is pending for analysis by our Product team. Once there is some information available about the status of this problem, we’ll update you here via this thread.