HP will support old HP-UX OS versions for ~10 years. Updates to major releases come every 6 months. And major releases come every 3 years.
And they guarantee forward compatibility if there are no kernel dependencies. They don't have a backward compatibility guarantee (build on a newer environment, for deployment on an older one).
Software from the old HP 9000 architecture can run under emulation on Itanium, or is guaranteed to be source code/build time compatible on Itanium.
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