But keep in mind that if you are on BES, there is nothing personal any longer. If this is a company provided device and they are paying the bills, my suggestion is that you keep your personal stuff off. If you need it, then get another device for that. Much safer and easier that way.
Also, keep in mind, all email goes into the main messages folder and into a folder for that specific account. Delete from one, it is gone from all. I don't use empower, so I cannot speak for what it can or cannot do.