My wife's business uses multiple Macs and multiple accounts per Mac. Apple's Backup needs to be used to back up data from the employee's accounts to my wife's one and only iDisk. In order for this to work the .mac information needs to be entered in the employee's account. Unfortunately this also means that my wife's email is available to any and all employees. Since I couldn't figure out a way to disable Mail from the employee's account only (without also disabling Backup), I decided that PadLock might do the trick. It did, and it does it very well. I was concerned that PadLock would apply its rules globally. It does not which enables me to lock Mail in the employee account, but not in her (the wife's) account. FYI: PadLock has to be running for it to work. There are check boxes in the app that allow you to set it to run at start up and to keep it invisible if you want. It doesn't suck a ton of resources either. It also requires a password to quit itself. This is good as it prevents someone from turning it off and then accessing the application you don't want accessed. Basically it does everything I needed it to and more. The interface is very easy to use. I don't have to continually mess with it. It just works. I'm very happy with it.