VIEWS: 256 PAGES: 7 POSTED ON: 5/29/2010
mRSS is a data feed not unlike normal RSS feeds. However, mRSS offers custom tags associated specifically with media content metadata, and that extra information about each item of content can make a big difference in the way content is ranked in the Bing index. Getting more specific information about video content enables Bing to have greater confidence in associating its relevance to the keywords you use in your descriptions, and thus it can improve your content's rank in queries using those keywords. And by using mRSS to submit your video content to Bing, you get a higher assurance that your content collection may be added to the Bing index more thoroughly and more quickly. Note, however, that video content does not get preferential ranking because it came from an mRSS feed. It's the keyword relevance derived from the metadata you supply in the mRSS feed that makes the difference.
"Bing mRSS FAQ"