The Windows 2000 claim about Type 45

Do Type 45 destroyers use Windows 2000 as their operating system?

Not in the simplistic sense usually claimed; Windows 2000 is associated with a boot layer, while the operational system is separate.

The answer rejects the idea that Type 45 simply runs its combat system on Windows 2000. Military equipment can use one layer to boot and a separate operating environment for its actual functions. Windows 2000 is described as part of that underlying boot basis rather than the whole warship system. The distinction matters because a familiar commercial component does not by itself describe the architecture or resilience of the combat system.