It's been pretty mainstream since 2012 IIRC. The article is correct though. Microsoft has never done it just fine. Their reports are constantly interrupted and

It's been pretty mainstream since 2012 IIRC. The article is correct though. Microsoft has never done it just fine. Their reports are constantly interrupted and at one point it lasted years. Microsoft also wasn't following spec on handling DMARC rules and would take failed messages with a reject policy that should have been dropped and then put them in the spam folder, creating massive phishing risk. I believe they have finally started to get their act straight but for a long time they were the biggest problem in the space. Google has usually been one of the leaders in the DMARC space though. Yahoo too.