Now we have a new player in the battle of (un)availability in the cloud. On March 11, 2015 Apple's iTunes store was down for 10 plus hours.
But look closer at that web page. First, we could see that web page unlike one of Microsoft's outages. Second, nothing was down but the App Store. iCloud Account & Sign In - Up. iCloud Backup - Up. iTunes in the Cloud - Up. And on and on.
And Apple acknowledged the same day that the downtime was caused by problems with its DNS setup.
The other cloud players could learn something from Apple.