Control over the taskbar and Communicator

I have to use Office Communicator at work - but unfortunately this is a huge distraction as every single message (and I have to be in a group chat) causes the taskbar to pop up and the icon to demand attention on the taskbar.

This is even though I have gone to Properties and Customize and specifically set it to "Hide icon and notifications" for Communicator 2007. You would think this would mean it would not come up, right?

Any advice on this would be most appreciated, it has been driving me crazy and I am ready to hack this thing.

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