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@Howard
There are very few cyclocross specific rims. If a rim maker has a CX category it's usually comprised of their road rims and they are basically saying yeah, you can ride this rim on a CX course.
Cyclocross specific rims seem to mostly be coming out of the US, from Stan's, such as the Iron Cross, a 40psi limit race rim, and Grail a road / CX PSI rated multisport / gravel rim.
Why wouldn't you use an MTB rim? Usually because they are a bit heavier than a road rim, a bit wider than a road rim, and bit overbuilt for CX. They also tend to be quite shallow. That said, plenty of people use Stan's Crest, and as road wheels have got wider and machined sidewalls are dropped for disc brakes there is some overlap.
Personally I'd go for Iron Cross if it was a race wheelset, Grail if you want some flexibility and hard ano Archetype if you want a complete all rounder that will also work on a frame without disc brakes too.
This thread should probably be merged into the CX thread.