The People Pane in Microsoft Outlook is a component of Outlook Social Connector that displays contact information and activity of an individual you are communicating with via email. Data for all persons included in an email, calendar meeting, or contacts list can be displayed in the People Pane to keep you up to date on tasks, as well as provide you a quick reference of emails, attachments, and meetings you have exchanged.
If you would like to remove this frame from Outlook, you have two options available for doing so.
The first method available simple turns off the People Pane so that it does not display when reviewing your emails in Outlook.
The second option is to disable Outlook’s Social Connector Add-in altogether. This too will remove the People Pane from displaying.