On: Service degradation on Microsoft 365

The best defense against cascading failures is limiting the blast radius, which is something AWS seems to do well but Azure does not.

Exchange Online and Microsoft 365 in general doesn't run on Azure.

How did that AWS DNS incident go recently? Unplanned outages are unfortunate but common, and hubris is the problem when everyone assumes that they (or their pet vendor) are immune.

From this we can tell where Jim Roskind works.