The release of WinFax PRO 4.0 in March 1994 brought together a number of key features and technologies. It introduced an improved OCR engine, introduced improvements aimed specifically at mobile fax users, better on-screen fax viewing capabilities and a focus on consistency and usability of the interface. It also included for the first time the ability to integrate directly with popular new email products such as and Microsoft Mail. It was preceded by a Workgroup version of the same product, which allowed a number of users to share a single fax modem on a networked system. The stand-alone version of the product was also later bundled with a grayscale scanner, and sold as WinFax Scanner.