In Microsoft Windows, the Briefcase was a special folder that supports simple two-way file synchronization between itself and another folder.
The Briefcase is designed for mobile PC users so that they may transfer it to a removable drive and have it synchronize with the computer to which the removable drive is attached.The briefcase behaves just like another folder, i.e. with support for copy-paste and drag-and-drop. It has additional functions and toolbar buttons for updating out-of-sync files.
The Windows Briefcase was introduced in Windows 95 and removed in Windows 8.
To use the Briefcase, users only need to use Windows Explorer and then drag or copy their files into the Briefcase once. Any further changes to either the files on disk or those in the Briefcase are synchronized whenever the user right-clicks on the briefcase and selects Update All.
If there are differences between the copies, the Briefcase shows a dialog box with an icon and a description indicating the action it will take when synchronizing; that is, whether it will replace the copy in the Briefcase with the external file or vice versa.