Hey Everyone -
We just migrated a client from a third party Exchange Service to in House on their new server that hosts Exchange 2010. The client computers are running Outlook 2007.
During the migration, when a few of the user's would send messages to other internal user's they would receive kick-backs stating that the user did not exist. I think that's do to us keeping
services alive with the third party vendor during the migration due to glitches. I had the user's remove all the drop down addresses of internal users as well as remove all those same users from her contact list. Problem is she was still getting the kickbacks.
Last night I finally severed ties with the vendor, however the problem occurs. Not sure if this will continue, but wanted any ideas to correct the issue if it still occurs.