One of the key risks with Cloud Computing is that of Data Centre outage. If you have a problem with you DC's then evey one knows about it.
That said, on-prem solutions have outages and I would suggest that most, if not all, on-prem solutions are less reliable and have more/longer outages than cloud DC's. So, is this risk real? It is for the DC owners (PR, SLA penalties etc.) but for most businesses the reliability on their systems will increase.
On the subject of outages, Google had a high profile one recently. We were impacted for a couple of hours and could not email or access our documents. That said we are still in business, dodn't lose any customers or business and depending on your view were inconvenienced / given a welcome break to grab a coffee and chew-the-fat!
Microsoft jumped on Goolge as soon as the outage was reported. I wonder how stupid they feel given their 22 hour DC outage at the back-end of last week with their new Cloud DC? Just as an FYI - in the 10 years that Google has been running its DC's the cumulative outages do not add up to 22 hours or anywhere near that!
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