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Recently Microsoft announced an update to MSNbot to reduce bandwidth resources during a site crawl. MSNbot v1.1 is now able to use HTTP compression and conditional get.

HTTP Compression: HTTP compression allows faster transmission time by compressing static files and application responses, reducing network load between your servers and our crawler.

Conditional Get: We support conditional get as defined by RFC 2616 (Section 14.25), generally we will not download the page unless it has changed since the last time we crawled it. As per the standard, our crawler will include the "If-Modified-Since" header & time of last download in the GET request and when available, our crawler will include the "If-None-Match" header and the ETag value in the GET request. If the content hasn't changed the web server will respond with a 304 HTTP response.

source: Live Search Webmaster Center Blog : Announcing Crawler Improvements for Live Search

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