2 years OS, 3 years monthly security, 4 years quarterly security. Plus, app updates are not tied to OS updates, so vulnerabilities in the browser and other buil

2 years OS, 3 years monthly security, 4 years quarterly security. Plus, app updates are not tied to OS updates, so vulnerabilities in the browser and other built-in apps can be more easily patched. Would 5 years of OS updates be appreciated? Of course! But 4 years of security updates isn't so bad.