[hooby]

It would seem they actually do whitelist some of their own stuff - specifically those weird "Microsoft Viva" emails that Outlook users get.

A year or two ago, I did get Outlook to classify those emails as "Junk" automatically, by repeatedly reporting them - but then something changed, and after that they never were marked as "junk" again - no matter how often I do report them.

[zamadatix]

I've never gotten a Microsoft Viva email across a couple of O365 accounts but none of the orgs ever set up Viva to my knowledge. If it's something your org set up it'd make sense it could break the rules, otherwise dunno.

[JohnFen]

Those emails are awful, but in fairness to Microsoft, there is a link in them that takes you to the settings page where you can turn them off. It worked for me, and I haven't received another one after that.

[Kwpolska]

Those e-mails can be easily turned off. I suppose they are not really e-mails, but rather something hybrid that happens on the Exchange server and bypasses the usual e-mail pipeline.