How to preload additional accounts on Windows 10

[Windows Central]

If you use more than one account to access your emails and apps, use this guide to add them to your Windows 10 primary account to allow apps easier and faster access.
Although, on Windows 10, signing in with a Microsoft account makes it easier to access additional benefits, such as the ability to sync settings, preferences, and files across devices without additional configuration, you still have to configure access manually for apps and services using a different account.
However, if you use multiple services with different accounts, the Settings app allows you to add them ahead of time allowing apps easier and faster access to your services.

Full story from the WindowsCentral blog...