Rackspace has completed their work in stabilizing their infrastructure and are continuing to monitor the system for errors, most of which they are automatically fixing. If you are still seeing any issues please review the information in the link below and contact us if you have any questions about possible missing messages or folders.
http://status.apps.rackspace.com/index/viewincidents?group=100
Over the weekend Rackspace has worked through a system-wide cleanup to address the after-effects of the high system load experienced last week. The load was the result of an unknown bug that impacted an effort to proactively double system capacity. Please see the system status update for more details: http://status.apps.rackspace.com/index/viewincidents?group=100