For convenience, the numbers on their status page [1] are: May 2015 99.999% April 2015 99.9% March 2015 99.999% February 2015 99.995

For convenience, the numbers on their status page [1] are: May 2015 99.999% April 2015 99.9% March 2015 99.999% February 2015 99.995% January 2015 99.99% December 2014 100% November 2014 99.84% October 2014 99.9% September 2014 99.998% 1: https://status.slack.com/calendar https://status.slack.com/calendar