The Internet of Things does not exist only in the digital world, and the technology that goes into paper mail is not as simple as one might imagine. That's why Pitney Bowes, a manufacturer of machines for sorting and handling mail, announced Tuesday that it is partnering with General Electric. Leveraging GE's Predix software, designed specifically for industrial IoT applications, the firms are collaborating on a set of applications for Pitney Bowes' enterprise business customers. Pitney Bowes sells mail-processing equipment to a range of customers, from the United States Postal Service to small and midsize businesses and very large enterprises. The fruits of its partnership with GE will initially be directed toward those enterprise customers and the service bureaus that provide them with mailing services. Roughly a quarter of Pitney Bowes' $4 billion in annual revenue is generated through the sales of mailing machines (systems that collate and insert printed paper materials into envelopes) and presorting services to large enterprises, such as banks, telecommunication firms and companies in the health-care industry, says Roger Pilc, Pitney Bowes' chief innovation officer.