The 10 Biggest Cloud Outages Of 2014 (So Far)
Microsoft Exchange, June 24
With the Lync outage fresh in the minds of Microsoft users, Microsoft's hosted email service, Exchange Online, suffered a similar fate the next day. Microsoft said the back-to-back Office 365 failures were unrelated.
The Exchange outage, which kept some customers out of their email for up to nine hours that Tuesday, was caused by an "intermittent failure in a directory role that caused a directory partition to stop responding to authentication requests," according to Microsoft.
The Lync and Exchange outages were aggravated by comments Microsoft tweeted the very next day -- and later conceded were ill-timed -- in which the company boasted about its speedy customer support.