People *really shouldn't* ask "Does product X support Unicode version
N?" They should be asking questions like "Can product X correctly
perform function Y on such-and-such characters added in Unicode version
N?"
This makes for a rather long list of questions if you want to know what Microsoft supports in a new OS or product release for instance.
One might think of how to best present the latest support level in a concise fashion and not on a per function per character basis.
P. A.