Rules and Resource Mailbox

I want to create a rule for a resource mailbox that is opened by a number of users with appropriate permissions to the mailbox. I create and run the rule however it will not move the message in the resource mailbox to another folder. Now if I create the same rule within the resource mailbox, it triggers automatically when mail is received.

How do rules work if you're creating one within your own mailbox to run for an opened mailbox within your Outlook i.e. I have two other inboxes opened within Outlook - how can I run rules against these two mailboxes?