Exotec Solutions offers an innovative order preparation system, based on a fleet of collaborative mobile robots. The Exo collaborative robots moves the bins among the warehouse, thanks to their no-infrastructure navigation. The Fleet Control supervisor coordinates motions of robots and bins. It interfaces with the WMS and assign movement missions to the Exos. The Exo system, interfaced with intra-logistic systems, offers an innovative logistic function: a virtual conveyor, with infinite paths possibilities , able to pick and drop on motorized or passive interfaces.