In a lengthy update to its service status page, Microsoft has explained the causes and resolutions to the extended downtime Outlook.com and Exchange ActiveSync users experienced earlier this week. The company says that it has "restored service so all customers should have normal access from all of their devices," though as The Next Web notes, there is still an issue for "a small percentage of mobile users" as of this writing.
Microsoft's explanation details the triage work system administrators needed to go through to identify and resolve the outage. The main issue was "a failure in a caching service that interfaces with devices using Exchange ActiveSync." That failure caused a cascade effect where devices flooded Microsoft's servers...
via The Verge - All Posts http://www.theverge.com/2013/8/17/4631622/microsoft-apologies-for-outlook-and-activesync-downtime-says-error
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