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MSN uses spidered results from Inktomi. With good links the Inktomi spider will eventually find you, and index your whole site for free.
It is also possible to pay for inclusion in the Inktomi search engine, but here you pay per page,and they seem reluctant to index any of your pages for free if you have paid.
MSN does have a complex strategy, there is much more that I do not know since I am indexed for free by Ink.