...and often people still send me the "Are U busy?" message despite my status being busy. I've started using the "Do not disturb" option in my Office Communica

...and often people still send me the "Are U busy?" message despite my status being busy. I've started using the "Do not disturb" option in my Office Communicator when am in important meetings. Using that option on the communicator makes it impossible for someone to send me a message. Any attempts explicitly fail on the sender's end with an error stating the obvious - The receiver has set "Do not Disturb"