Microsoft announced this week that their “multi-factor” authentication is now available for the majority of Office 365 plans – midsize, enterprise, academic, non-profit and even standalone plans for Exchange Online and SharePoint Online. I guess that just leaves out the “P” plans.
More importantly, there will be no extra charge for this new feature, and it is purely optional whether you implement it at all.
Microsoft is calling it “multi-factor” instead of “two factor” authentication because you have multiple options for getting that second authentication.
Check out the Microsoft Office Blog for details and screen shots!