Just a quick one. I've noticed some folders in Local Settings\Application Data\Microsoft\Messenger. I know that usually the folders in there are named using the e-mail address of those who have logged in on that machine, except there are quite a few e-mail addresses I don't recognise have their own folders. They may be friends' e-mail addresses, but they would never have logged in on my system. Any advice? I've searched Google extensively and found nothing. It's bugging me!

Thanks.