in–box /ˈɪnˌbɑ:ks/ noun plural in–box·es
] 1 US :
a box or other container on a desk in which letters, notes, etc., that are sent to the desk are placed —called also (Brit) in tray
; — see picture at office
; compare out-box
2 computers :
a computer folder that holds new e-mail messages ▪ There are five new messages in your in-box.