Hi, we have Exchange 2007 running in our environment. Is there a way I can set OOF on a mailbox to run every nite between 6:00pm and 9:00am in the moring? Reason is that some of our external customers do replay back on this account after close of business and no response is delivered back to them. Thanks Isaac2k2

You could create an automated script: http://www.mikepfeiffer.net/2010/07/manage-exchange-2007-out-of-office-oof-settings-with-powershell-and-the-ews-managed-api/ or create hub Transport rules that reply back and enable and disable with an automated script.