OT technologies were developed in the early 20th century, many decades before the rise of IT. Traditionally, OT and IT networks were separated by an air gap. Now, the two are being integrated to increase business value. How then can organisations mitigate OT cyber risk in this new converged environment? The answer is with the Fortinet Security Fabric, a transformative and unique security architecture. The Security Fabric integrates best-in-class security solutions to provide broad visibility across both the OT and IT attack surface, while automating operations and providing continuous trust assessments. This white paper covers five cybersecurity best practices that strengthen the OT cybersecurity posture and maps components of the Security Fabric to each of them. The aggregate solution from Fortinet serves as a foundation for converging IT and OT environments and achieving new business value.