how do I go back to outlook 2003 bcm

My new computer came with outlook 2007 with bcm. When I transferred and
upgraded my 2003 data there was no mention that I would have to purchase 3
more office suites to let everyone in our small office share bcm. As I guess
many of you know - outlook 2007 with bcm is not available as a stand alone.
How do I go back to 2003 bcm without losing all my data and contacts. I have
no intest in spending $900 to buy 3 new office 2007 suites upgrades.

As an aside, don't you think a warning about this condition should have been
mentioned during the conversion?
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tc9004