It’s 2020. We are now progressing more and more toward the cloud and will have to take into consideration security concerns that relate to the cloud. 2 large players in the cloud for productivity suites include Google and Microsoft.

Since Microsoft still dominates the market when it comes to workstation operating systems and office suites, Office 365 is being adopted pretty quickly. I really recommend that you to take a look at this post if you currently have Office 365:

Introducing the Microsoft Office 365 Email Security Checklist

It has some good pointers that will help you lock your Office 365 tenant down. Of course there is Microsoft Secure Score, but it seems as if it’s in its infancy. It is buggy and not reliable. This is not to say it won’t help you harden your tenant, but I wouldn’t let it necessarily be the golden rule.

One must also keep in mind that to make Office 365 ‘more secure’ according to Microsoft, you need to essentially pay for it. Standard subscriptions won’t get you certain features. ( Please see: https://products.office.com/en-us/exchange/advance-threat-protection#office-ProductsCompare-785zwzq )

#Update 3/3/20:

Infragard presentation on Office 365 Security:

https://drive.google.com/open?id=1_n9RocH3-J0cwfj4l3RyzFCC-Qfd1g4Q