
“The vast majority of people using Gmail have seen few issues, experienced no downtime, and have continued to have a great Gmail experience, with exception of an outage in August 2008,” said Matthew Glotzbach, product management director of Google Enterprise.
“If you average all these data together, including the August outage, across the entire Gmail service, there has been an aggregate 10-15 minutes of downtime per month over the last year of providing the service. That 10-15 minutes per month average represents small delays of a couple of seconds here and there.”
He pointed to recent research by the Radicali group which found that Google Apps was more reliable than Groupwise, Lotus or Exchange.
“Gmail's reliability jumps to more than four times as reliable as a GroupWise solution and 10 times more reliable than an Exchange-based solution if you factor in the planned outages inherent in on-premises messaging platforms,” Glotzbach said.