Microsoft has notified us that they consider this issue resolved, and no outage actually happened:
Final status: The investigation is complete and we've determined the service is healthy. Although we took precaution of investigating the impacted infrastructure, we determined that a service incident did not actually occur.
Posted Sep 07, 2017 - 15:45 EDT
Investigating
Catmail email & calendar: Some Mac and iOS users may not be able to use Skype for Business. Bulletin from Microsoft:
Office 365 Incident LY116880 - Skype for Business on Mac and iOS devices*
*User impact:* Users may be unable to access Skype for Business when using a Mac or iOS device.
*Current status:* We're analyzing log data from the affected environment to isolate the cause of the issue and determine the next troubleshooting steps.
*Scope of impact:* Impact is specific to the subset of your users that are using a Mac or iOS device.
Technicians are investigating the issue.
Affected services:
Catmail email and calendar
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