Do you want to know the content of each email sent by your employees in the office, so as to verify that they are all related to work? Well, this you can do thanks to a plug-in for MS Outlook called Silent BCC.
Silent BCC for MS Outlook makes sure that a copy of all the emails sent from your office/company are is also sent, silently and invisibly, to your account. This way you can always know what is happening, what your employees are doing with their time, and also that they are working for the company.
To be able to install Silent BCC for MS Outlook you need MS Outlook 2000 or later.