This feature is only available in Enterprise Edition.
When set, the Quarantine Location specifies where the default location for a file you decide to quarantine will be securely moved. This location should be a secure folder on your computer, such as an encrypted drive or one to which unauthorized individuals cannot gain access. If you choose the Leave Behind Warning Text Document in Place of File then a text file will be created in its place named exactly the same as the original file including its extension but with a .txt appended to the end. If your file was c:\test.doc then a file c:\test.doc.txt will be left in its place after it is quarantined.
The text file is useful to notify the original file owner that you moved their file securely. Here is a sample of the text:
The original file, c:\test.doc, contained unsecured, personally identifiable information. It has been quarantined to: d:\test.doc
To view or change these settings, click the Settings button on the Tools and Options ribbon.