Forum Moderators: open
I once got plagued by MSIECrawler for months. At that time it was IE 4.0, and pretty virulent. It seems calmer in later versions of IE.
I had dozens of (mostly) Russian sites downloading robots.txt and nothing else. Drove me nuts, and there was nothing in my robots.txt to disallow further download. Messed my stats up completely :-(
Digging around suggested MSIECrawler might also have been related to the "Channels" that MS tried to put on the desktop a few years back. My guess is that somehow I got mentioned in a Russian Channel and these people were probably accessing my site without even knowing.
Isn't the web a wonderful thing ? :-)