I prefer Leslie's "not my problem any more" attitude.

If it's not client-critical, i.e. the situation doesn't threaten to come to pointing fingers, I'd say it's safe to assume that Windows would not interfere with the signal path. Not so with MacOS, though.
Of course, you need to calibrate the monitor in order to be able to trust it. And I mean calibrate it properly in hardware, not just WB and gamma as many automatic calibration tools do.
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