MSN Live Search is not displaying URLs correctly. In the screenshot below, it shows URLs from PocketSEO.com without a trailing slash. Yet the link above it goes to the correct URL (with the trailing slash).
A slash is the symbol for a directory. In *nix, a directory is treated as a file. A URL without a trailing slash is a different URL than one with a trailing slash. MSN Live Search is displaying the wrong URLs in the SERPs.