Steps to disable autocomplete on Exchange server 1. Run the following command: Get-ClientAccessServer 2. The command above will return the value of the CAS (client access server) from the environment. Copy & save all the info returned to a text file for record. 3. Run the following command and set "CASxx" to the name of the CAS server: Set-ClientAccessServer –Identity “KAHNSBS” –AutoDiscoverServiceInternalUri $NULL