Whatever you want to delete – any item type (email message, folder, IM contact ...), select the item and hit the DEL key or alternatively, just use drag ‘n’ drop. Drag the item onto the trash bin icon within the Navigation Pane and drop it when the icon becomes highlighted.

Tip: Hold the CTRL key when dragging and dropping not to be asked to confirm deletion.

Note: The difference between Trash and Recovery items is that Trash is available for email items only while Recovery Items is available only for groupware folders.