Outlook Filed Mail Flag

To Show/Hide the Flag column right click on the 'Inbox'

And from the pop up menu click on 'Customize Current View'. From the dialog click on 'Fields...'

Select the 'User-defined fields in Inbox' and you should see the 'CRM Status' field

Click 'Add ->' button to add this to the view. Click 'OK' to save changes. When emails are filed you will see the flag