How to protect Microsoft Outlook from unauthorized access?

Overview

Nowdays, everyone use MS Outlook as mail tool to Send/Receive the email for my daily work. I ensure that you did not want to leak any confidential data in Outlook like me. This article will guide you the way how to protect MS Outlook from unauthorized.

I use MS Outlock 2016 and i will open it from Windows Start.
Open Outlook, and on the File tab, choose Account Settings > Account Settings.

On the Data Files tab, choose the Outlook Data File (.pst) for which you want to create or change a password, and then choose Settings.
Choose Change password.
Note: The Change Password button doesn’t appear if you’re using an Exchange account. Your network password is used to access your Exchange account and information.
In the Change Password dialog box, in the New password and Verify password boxes, type a password that’s 15 characters or less.