The Mark Emails as Filed option helps you to turn on or turn off the indicators that appear in Microsoft Outlook in Mac for emails that are saved to iManage using the Services > Save Email Message to iManage Work option:
The label that appears for the emails in the list view.
The label that appears to the right-side of the email subject in the reading pane.
The following values are available for the option:
true: The Filed to iManage label is applied (default value).
false: The Filed to iManage label is not applied.
<key>Mark Emails as Filed</key>