System and method for blending the results of a classifier and a search engine:
A method to produce a list of documents retrieved from a search engine, ranked according to their relevance to search terms, includes interleaving the lists resulting from two searches. The first search is one that occurs over documents where the list is [...]

MSN introduced RankNet, a new tecnology to rank search results. The algorithm is described in “Learning to Rank using Gradient Descent“. For details, please read MSN Search and Learning to Rank by Greg Linden.
Also, new MSN Search commands are being offered:
FileType – restricts documents to a particular filetype.
InAnchor:, InURL:, InTitle:, and InBody – let [...]

According to The Direct Marketing Association:
Microsoft will begin next week to notify its Hotmail customers when the Sender ID protocol is unable to verify the authenticity of an e-mail message. Messages that have not been authenticated will most likely be placed into a customer’s junk folder or deleted altogether in conjunction with other spam filters.
According [...]