I am looking for methods or tools to monitor shared folder activity such as file modifications, deletes, access, etc. I would also like to know the user who is responsible for an action on a file. If possible, I'd like to have certain actions (such as delete) emailed to me as well.

I had been in a situation where I want to monitor all my employees who are sharing data from my server. I want to monitor all those people. Please help me out.