This week Microsoft experienced outages due to severe weather taking out a cooling systems in data centers located in SAN Antonio, Texas. South Central U.S felt the brunt of the outages, however, many were affected one way or another throughout the globe. When something like this happens, it’s a good reminder for businesses to look at ways to build redundancy around their critical applications.

Here is an article around how Mimecast builds redundancy around Exchange

AZURE/OFFICE 365 OUTAGES: THE IT ADMINS GUIDE TO CONTINUITY
SEPTEMBER 6, 2018, by J. Peter Bruzzese
https://www.mimecast.com/blog/2018/09/azureoffice-365-outages/