Last year Microsoft launched a new search engine which couldn’t find itself and obviously didn’t want to make the same mistake again.
It seems that the MSN Live Search results for each country have all been hand edited to include the geo-specific version of Bing.com as the top result. You can tell by the fact the URL being indexed is www.bing.com/?mkt=de-de when you search on MSN.de and www.bing.com/?mkt=en-gb when you search on MSN.co.uk
Those URL’s don’t exist and both redirect to a holding page so there is no way anybody would be linking to them. Google certainly isn’t indexing them.
Joking aside I’m looking forward to using Bing, about time somebody started eating into Googles 90+% market share in the UK. Most SEO’s with less than a few years experience probably don’t remember the days of optimising for more than one search engine.