A client is seeing bugs on their website using MSN Explorer. I can't reproduce those bugs with IE7 or any other browser, and I can't use MSN Explorer, because it requires a subscription to MSN.
From the install page here, there is this note at the bottom:
Note: this version of MSN contains Internet Explorer 5.5
Hopefully that helps. I can't use MSN explorer either, so there is no guarantee that this information is correct.
Edit: The IE 5.5 information is corroborated by the warning I got when trying to access this site from Linux: http://explorer.msn.com/langwarn.htm?prompt=1
Based on the info above, if you can find a screenshot site that supports IE 5.5, I would imagine the rendering should match MSN explorer.
Oh, it's incredibly possible. If you can't get a version of IE 5.5, at the very least, I would suggest grabbing a copy of IE 6. Microsoft supports Virtual PC images that come installed with IE 6 that you could use to test.