Microsoft Exchange server is a client-server collaborative application produced by Microsoft. Today for most of businesses whether it is small or big, email is the most critical source of communication inside as well as outside the organization. Today, everyone is heavily dependent on mails looks for rich, efficient access—to send e-mail, calendars, attachments, contacts, etc. Sometime peoples never think at which atmosphere they are accessing there e-mail data or what type of device they are using, weather its secure according to the security purpose or not. However, security is the main concern to everyone.