I don't know what the criteria for calculating uptime is, but I know that if you have 1 billion users, if every time more than 2 of yours users can't reach your

I don't know what the criteria for calculating uptime is, but I know that if you have 1 billion users, if every time more than 2 of yours users can't reach your servers you consider that downtime, you'd probably be 100% down. If you know how many Google Apps users couldn't use the apps and that number was substantial, you have a point. But if you have no idea how many people had that problem, it is possible that the number was very small and that you were just unlucky. Personally, I've found all of Google's services very dependable.