Microsoft's biometric facial recognition technology, is designed with stringent security standards:

False Accept Rate (FAR): This measures the likelihood of an unauthorized person being incorrectly authenticated. For Microsoft, the FAR is specified to be less than 0.001%, meaning fewer than 1 in 100,000 unauthorized attempts might be falsely accepted. 

False Reject Rate (FRR): This indicates the probability of a legitimate user being incorrectly denied access. Windows Hello aims for an FRR below 5% without anti-spoofing measures and under 10% with anti-spoofing or liveness detection in real-world scenarios.