For more detailed information, visit https://www.microsoft.com/en-ww/microsoft-365/support.
After you sign up for Microsoft 365 Business Premium, you’ll want to copy your existing work files to OneDrive for Business. OneDrive is a good place to store personal work files or sensitive business files that you want to control access to.
In addition to working on your OneDrive files locally, you can access them from your web browser: