we're getting bounce backs of a user we transitioned from Exchange 2000 to the new Exchange 2010.
Whenever the 'autocomplete' is used, there is a bounce back. If the user is selected from the Address book directly, then it's fine.
I've added the x500 details on in ADin the Attribute editor in the 'Proxy' section, like we have for every other user we transitioned. So I'm baffled as to what else we need to do here!
This is the bounce back:
Any ideas guys?
thanks for helping