Could we uncheck that 'automatically decline...' option instead of using /forcerebasesuppressallupdates on just res mailboxes?

Q: Could we uncheck that 'automatically decline...' option instead of using /forcerebasesuppressallupdates on just res mailboxes? I am going to have a very hard time identifying all res mailboxes, so I would like an alternative, if there is 1
A: You can do this, but you may end up double-booking some of your resources. If you go this route you'll need to put the word out to your resource administrators that they need to manually go through and check for problems.