We are migrating to Hosted Exchange. I migrated 3 users running Outlook 2007 on Friday and was able to connect tot eh Exchange server without issue. The users could not open Outlook this morning, they were being prompted for a username and password. Could not connect after entering their password. Our Microsoft consultant said it is an "autodiscover" setting on the local machine or in Active directory. I flushed the DNS on the workstations and was able to connect. Can you tell me where to check for the 'autodiscovery" setting for Exchange or Outlook on both the workstation and also in DNS on the domain controllers. DNS is active directory integrated.