passes along a posting on Google's official blog announcing that they have extended the three-nines SLA
for the Premier Edition of Google Apps from Gmail alone to also cover the Calendar, Docs, Sites, and Google Talk services. 99.9% uptime translates to 45 minutes a month of downtime, and the blog post puts this in context with Gmail's historical reliability, which has been between three and four times as good over the last year (10-15 min./mo.). It also claims, based on research by an outside group, that Gmail's historical reliability beats that of in-house hosted solutions such as Groupwise and Exchange, on average. Reader Ian Lamont
adds an article in The Standard that digs down into the details of the SLA
, revealing for instance that outages of less than 10 minutes aren't counted against the monthly 45 minutes.