It’s frankly not easy to tell after the program is installed; there are clues in the Office programs when you click on through a Microsoft Work account, but then be linked to a Microsoft Personal account by the person using them. This is what One Drive for Business looks like when you log in with a Microsoft Work account.The name of the signed-in person in the upper right doesn’t have anything to do with the license. This is what One Drive looks like when you log in with a Microsoft Personal account.This side of Microsoft includes Office 365 business mailboxes, Azure cloud services, Sharepoint, and much more.
For example, if your Google account login is [email protected], you could use Gmail for email but it’s not required. Similarly: imagine that you have an Amazon account and a New York Times account. You might use the same password, you might use a different password.It is working on a “unified sync client” that connects your computer to both the work and personal One Drive services, which might theoretically make it easier to tell the two services apart on your computer or mobile device. The good news: most small businesses will not use Skype for Business; it is intended primarily for enterprises and requires significant IT resources.I would guess that it will keep changing the names around to try to make it easier to find your place. If you see references to Skype, it will take careful attention to discover whether it concerns the version of Skype that you’re using.(You won’t see this on computers running Windows 10 Home.) If you (or your IT department) identify the computer as owned by the organization, then one of the options is to log in with a or a local domain.The Azure AD choice is built on Azure Active Directory, which Microsoft is exposing for all companies with a business Office 365 account.