One of my clients would like to use email (specifcally webmail) for interoffice communication in a dental office (also occasionally want to be able to view outside the office). The office has approx 30 associates who would use this method of communication. Email is of course slow and insecure so I am considering Google Talk (IM). I would like to know:
1) how secure/insecure is this?
2) Is there a way that I can control passwords for all of the users?
3) what port does G Talk use and is it always open (listening?) and is that a security risk?
Is there a better way to achieve the same result?