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Office Account

On this tab, you can see details about your Office product as well as your user information. You can switch accounts, see your connected services (such as your Office 365 account), and change your Office background and theme:

You can also use Add a service here. This gives you the ability to add in another Office 365 or OneDrive-Personal account. Adding a connected service gives your Office the ability to access the services and information in that account with respect to the Office application. For example, adding a connect service through Word will give Word the ability to access Word files in those connected accounts.

In Outlook, this function is not as obvious as in the other Office applications, but it gives you the ability to more easily access files from your OneDrive—personal and Office 365 accounts to be added as attachments into an email message:

To add an Office 365 account or a OneDrive - Personal account to your Outlook, click on Add a service, followed by Storage, and then on either Office 365 SharePoint or OneDrive:

Choosing Office 365 SharePoint gives Outlook the ability to access SharePoint and OneDrive for Business files via that Office 365 account. Choosing OneDrive is the personal version of OneDrive connected to your Microsoft account.