I've solved it!! The problem had to do with the language. Loading search.msn.com from a browser configured in spanish actually loads search.msn.es, so the /developer folder is not found. Setting in English the MSN Search Engine works it out.
Thank you again.
Crazygon
Hi,
you should report this issue as a bug anywhere.
Ralph | mark best reply as answer
Ralph G
It is currently By Design to only have the developer site available for the en-us market.