Ben Poon just posted over on the Windows Live Mail blog that the latest build (M8) is now available to all. It was originally released 2 weeks ago as part of a gradual roll out to the service's 9million users, presumably in an effort to avoid some of the glitches that were experienced with the M6 release.

Impressions of the new build have been extremely favourable, especially concerning the improved performance that many users are seeing. With Live Mail now approaching v1 status, we'll hopefully soon see the availability of @live.com addresses.

Windows Live Mail blog – M8: Friendly, Fast, Reliable
LiveSide  – Live Mail gets update to M8