Let users know (via email) if they should update their system or not
Guys, if you could let us know if we (Mac users) should update our Macs or not, that would be great. You got our emails. You could just send one email to all registered users 'hi guys, our products are not ready for new version of your OS, please be careful with update'. It costs you nothing. That would save a lot of our nerves. Of course, we could check your website before updating, but it is so inconvenient.