By working together with one of our favorite Customers, we realized that the Microsoft NX-6000 webcam doesn't work with Office Communicator 2007. I'll address this to the product groups and ask them to publish it officially if they haven't yet.
By the way, it's a really nice piece of hardware and I love to use it with Messenger, but it seems that it's not Communicator's cup of tea. Hopefully you found this post early enough. My Customer went back to the hardware shop straight away and bought 3 pieces of VX-1000. We also tested and found that VX-6000 works fine with Communicator 2007.