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If you scroll through the replies you will see ways that work....here is what worked for me and many others who have done what I suggest.
Set up a temporary out of office notice with a start and end time close to the time you create it. It will only display for a few minutes. Outlook gives you the option to display the out of office only at certain times. Set it to start at 8:45 am whatever time is closest to when you are setting it up and then set the time for it to stop displaying at the next available time. The longest it might be up is 15 minutes but it solves the problem by turning the OOO off at the time it is scheduled to turn off.