Disable all the options except for the first reference to: Updating Outlook manually Even though Outlook is the last in the chain, it is often the first level where the troubleshooting takes place as usually this is where the request is coming from. This allows you to abort the update process when you are for instance on a slow or expensive connection. Therefore, after shutting down exchange server, client cannot find the public folder to update local OAB. In a later section, it is explained how to modify this. Above steps are not enough unless the new public folder store have the OAB folder in the public folder, so you need bring Exchange server online and add Exchange as the replication for system folder on public folder tree you need click view system folder to show the system folder.