March 21, 2017

"On March 21, users across the world began reporting via Twitter that they couldn't sign into Outlook.com, OneDrive and Skype, (and possibly more)."

ZD Net: MSA is Microsoft's single sign-on service which authenticates users so they can log into their various Microsoft services. by Mary Jo Foley

'As happened two weeks ago, Skype Heartbeat site, has posted a message noting that users may be experiencing problems sending messages and signing in:

'"We are actively investigating problem, preventing users from signing-in and sending Skype-to-Skype messages! We'll let you know as soon, as issues are resolved."'

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