This is a tough one and the man/woman who fixes it will be rewarded greatly
I have a site that has users who frequently go in and out of the office. Now they can set up there own rule to do this using the Out of Office features in Outlook 2003. They are running Exchange 2000 just so you know.
The problem occurs after a few days of it being on the auto forwarding rule turns off but the Outlook Out of Office part stays on. So people get the automated reply but the mails don't get forwarded to the person that the user who is out and about has specified. On inspection you can go into their Outlook and there is a big Error cross on the rule saying its disabled - you can re-enable it and it will begin to work again but will do the same again a few days later.
The easy work around is to turn on the O.O.A and then go to the user in ADUC (Users and Computers) and use the Exchange General tab and just set it in the Delivery Options properties. If someone could tell me what could cause this problem to occur I would be appreciative in the up most.