I wonder if anyone came accross the same issue, and has an answer for it…
I just had transittioned our exchange org from 2003 to 2007 version and now everytime someone from our users replies to a meeting that was sent to them from the specific user will get an error message shown in an attachement:
Also it is only happening when meeting request is sent from that specific user.
The user that NDR is pointing to is no longer in our system, or I am not able to find him. Tried to look in exchange; AD objects etc.
Searched with ADSIEDIT tool – could not find any object with this users name.
Also tried to create another account using his exact name that he was setup with previously, and I was able to do it….
I have checked configuration of an outlook client, that meeting request is sent from, and could not find any rules or settings that point to that “misterious” user name.