The paper concerns recent advances in reaching the goal of industrial operating system (OS) verification. By industrial OS we mean a system actively used in some industrial domain, elaborated and maintained for a significant time, not a proof-of-concept OS developed with mostly research intentions. We consider decomposition of this goal into tasks related with various functional components of OS and various properties under verification, and application of different verification methods to those tasks. This is a trial to explicate and summarize the experience of several projects on various OS components and different OS features verification conducted in ISP RAS.