In the image below, we see the Home tab of the Outlook 2016 application and at the left corner of the window we can notice the three different E-Mail Accounts that exist. There are two ways in order for us to check out the Size of our Mailbox and which will be described below: Outlook doesn’t only lets us check out the Total Size of it, but we can see the Size of each Folder within it. Many times we want to check out the size of our Mailbox in Outlook.
