After working as a Windows admin for a few years, I feel that it is one of those things that <i>sound</i> like a great idea at first, but are causing more problems than they prevent.<p>But years as a Unix user might have made me biased. I am certain people can come up with lots of stories about how a file being opened prevented them from accidentally deleting it or something similar. I am not saying it is a complete misfeature, just a very two-edged sword.