If you get personal emails at work, you may want to protect them so that others can't read your private mail. If you are using Outlook, it allows you to password protect folders. All you need to do to protect your mail is put your personal mail into specific folders and then password protect those folders.

To password protect a folder, go to Tools -> Options and then select the Mail Setup tab. Click Data Files and you can then pick the folders to protect. Once you finish selecting folders, click Settings and then Change Password. Enter your password, click OK, and then any mail in your selected folders is secure.