A better Qn perhaps;
What are the chances of liability being proven, what are ALL the ways in which it could come unstuck & .: linkages be clearly made between HiFo & 3rd-party host(s)?
If after doing thorough analysis there it's clear that the risk is too great, then perhaps we need to look at dismantling HiFo in the US, & re-establishing it elsewhere?

BUT, before we do any of that, we should try (just once more) to:
(1) Confirm that Nokia definitely no longer has hosting rights...
(2) If they don't, then we ask MS (once more) if they can continue to host.
(3) If Nokia has rights, ask them (once more) if they can help by hosting (perhaps HiFo can pay them for bandwidth/infra etc).