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).