Hello, is there an official table showing windows OSes (client, server, 64-bit, 32-bit, arm etc) supported by/fully tested to work with OS query?

I don’t think there’s a good table like that, but perhaps there should be. I opened an issue here https://github.com/osquery/osquery/issues/8418 For an unofficial answer: I believe the automated tests in CI run on Windows 2019, 64-bit ARM and Intel x86-64. But there are far more versions of platform than there are CI runners. The test suite is the only “fully tested” that exists, and it is not checked for all platforms with every release because of practical limitations. Windows x86 32-bit is supported, that was added back in 2020 I believe.

A correction to that is that Windows ARM is only a build done on x86, it's not tested. But basically the support for Windows is 10 and above, with 7 not being actively tested, and also not actively trying to remove support for it (but there maybe tables not working/being unstable).