Someone purchased their desktop office suite with their computer. Somehow you can activate the software license using the Microsoft account that was setup during the first steps of Windows 10 out of the box experience. www.office.com
offers the ability to download and reuse that key if you have your Windows credentials for future use... ie a replacement computer.
Is there a graceful upgrade route to office 365 Exchange service from www.office.com
or do I simply create a new account from the Microsoft hosted Exchange plans that I select on the office 365 Essentials buy now options. PS Did they change their pricing here? I see a $4mo Exchange mailbox vs $8mo plan.