Below is a message I received from Google Apps today regarding a recent Google Apps (Gmail) web interface mail outage.
--- START GOOGLE EMAIL---
"Dear Google Apps customer,
We would like to follow up on the recent Gmail outage and resulting credit through our service level agreement (SLA) with you.
Between 12:45 PM to 2:15 PM PDT | 19:45 - 21:15 GMT on Tuesday, September 1, 2009, Google Apps Gmail users were unable to access their accounts