A device for transporting, storing and discharging postal items, comprising: - a plurality of modules arranged aligned with respect to one another along a first rectilinear direction; each module being provided with a trolley movable with reversible rectilinear motion under the driving force of first motor means along a second rectilinear direction transversal to the first direction between a first parking position and at least a second parking position; each trolley being provided with a belt, which extends between opposite end portions (15a, 15b) of the trolley and is movable along a direction (Dn) parallel to the first direction in selectable opposite directions under the driving force of second motor means; - two first outlets arranged under each trolley when it is arranged in the respective first position and two second outlets arranged under each trolley-s- when it is arranged in a different parking position; said first/second outlets are adapted to receive the postal objects that are discharged from opposite end portions of the trolleys (15a, 15b) of contiguous modules following the motion of its belt; - an electronic control unit of said transport device adapted to implement: - a transport mode for transporting items, wherein at least one pair of trolleys belonging to successive adjacent modules is arranged in corresponding parking positions and the postal items proceed along said first rectilinear direction, transiting from one module to the adjacent one under the action of the belts, which move in the same direction; and - a discharge mode for discharging to four outlets A, B, C and D, wherein at least one trolley of a selected intermediate module is arranged in either the first or second position and at least one of the trolleys belonging to modules adjacent to the selected one is arranged in a different, second or first, position; the motion of the belt of the trolley of the selected module towards the following adjacent module allows directing the postal items carried by the belt towards an outlet B or an outlet D belonging to the first/second outlets of the following adjacent module; the motion of the belt towards the preceding adjacent module allows directing the postal items carried by the belt 16 either towards an outlet A or an outlet C belonging to the first/second outlets of the preceding adjacent module; the motion of the belt of the trolley belonging to the preceding adjacent module towards the selected module allows directing the objects either towards the outlet B or towards the outlet D belonging to the first/second outlets of the selected module; the motion of the belt of the trolley belonging to the following adjacent module towards the selected module allows directing the objects either towards the outlet A or towards the outlet C belonging to the first/second outlets of the selected module. - a plurality of modules arranged aligned with respect to one another along a first rectilinear direction; each module being provided with a trolley movable with reversible rectilinear motion under the driving force of first motor means along a second rectilinear direction transversal to the first direction between a first parking position and at least a second parking position; each trolley being provided with a belt, which extends between opposite end portions (15a, 15b) of the trolley and is movable along a direction (Dn) parallel to the first direction in selectable opposite directions under the driving force of second motor means; - two first outlets arranged under each trolley when it is arranged in the respective first position and two second outlets arranged under each trolley-s- when it is arranged in a different parking position; said first/second outlets are adapted to receive the postal objects that are discharged from opposite end portions of the trolleys (15a, 15b) of contiguous modules following the motion of its belt; - an electronic control unit of said transport device adapted to implement: - a transport mode for transporting items, wherein at least one pair of trolleys belonging to successive adjacent modules is arranged in corresponding parking positions and the postal items proceed along said first rectilinear direction, transiting from one module to the adjacent one under the action of the belts, which move in the same direction; and - a discharge mode for discharging to four outlets A, B, C and D, wherein at least one trolley of a selected intermediate module is arranged in either the first or second position and at least one of the trolleys belonging to modules adjacent to the selected one is arranged in a different, second or first, position; the motion of the belt of the trolley of the selected module towards the following adjacent module allows directing the postal items carried by the belt towards an outlet B or an outlet D belonging to the first/second outlets of the following adjacent module; the motion of the belt towards the preceding adjacent module allows directing the postal items carried by the belt 16 either towards an outlet A or an outlet C belonging to the first/second outlets of the preceding adjacent module; the motion of the belt of the trolley belonging to the preceding adjacent module towards the selected module allows directing the objects either towards the outlet B or towards the outlet D belonging to the first/second outlets of the selected module; the motion of the belt of the trolley belonging to the following adjacent module towards the selected module allows directing the objects either towards the outlet A or towards the outlet C belonging to the first/second outlets of the selected module.