We are having an issue with mirrored folders that I'm wondering if we can fix.

We are in the process of changing over to the Teaming product. To help folks out, we've mirrored their current shared folders for documentation. The issue we found is that when a person opens a document from the share, there is no notification on the teaming site that the file is opened. Therefore, if a person opens the same document from the teaming site, edits it, and attempts to save it, they receive an error. Which would be alright, except, the document is then wiped out completely. It is reduced to 0 bytes. Is there a way to notify folks on the teaming site, that the document is opened outside of teaming and is unavailable?