The trash has been introduced with Feng Office 1.1. It works like the trash on your computer desktop: If you delete an object, it is not permanently deleted right away but moved into the trash, from where it can be recovered (restored) if necessary.
PLEASE NOTE:
In Feng Office the trash is located under the workspace selector. Clicking on the correspondent workspace, client, or project, and then on “Trash” will open the “Trash” tab that contains all deleted objects from the last 30 days.