by Tony Redmond in the Windows IT Pro Maganize. Tony is HP's veteran and Microsoft MVP for Exchange Server and his opinion matters for a bit or two..
In his article, Tony compares Google Apps SLA with Microsoft Office 365 SLA and here is the quote:
Here are few more quotes:
"In terms of 2011 performance, in a September 27 article about their new status dashboard for Google Apps, Google state that they achieved an SLA of 99.99% for Gmail in the first six months of the year, or about five minutes downtime per month. I assume that this is measured against their new SLA calculation including scheduled downtime so this is really a terrific performance."
"Comparable data for Microsoft is unavailable, though their service notifications show 113 incidents in 2010: 74 unplanned outages, and 33 days with planned downtime."
You can find a full article here.