Online Microsoft Project Viewer - Version 1.0 Free desktop client for online Microsoft Project viewer service. This web service lets you view mpp files online without the need to purchase and install MS Project:- Upload Microsoft Project plans and view them online- Share plans with your customers and colleagues without having them install Microsoft Project- Save on Microsoft Project licenses.Supported MS Project file formats: MPX (Microsoft Project 4.0, 4.1, and 98) and MPP (Microsoft Project 98, 2000, 2002, 2003, and 2007).