A:AnswerNo, you cannot upgrade if your subscription is managed by Best Buy. The instructions provided in the other answer simply send you in a circle between your Microsoft account and your Best Buy account
A:AnswerAfter I paid for the Office 365 subscription, I received an email from Best Buy with the product key included in the text of the email (scroll down to find it). The subject line of the email was this:
"How to install your new Microsoft Office 365 software"
A:AnswerGo to the Services & subscriptions page.
If prompted, sign in with the Microsoft account email and password associated with your Microsoft 365 subscription.
On the Services & subscriptions page, locate your Microsoft 365 subscription and then select Manage.
Do one of the following:
If you see a Turn off recurring billing link, choose it to turn recurring billing off.
If you see a Cancel link, choose it to cancel the subscription. You might be given the choice to get a refund for unused time. If you choose to get a refund, the subscription will go into reduced functionality mode immediately. Otherwise, you'll have access to your subscription until it expires.
If you see a Turn on recurring billing link, it means recurring billing is already turned off.
If you don't see options for Turn off recurring billing or Cancel, but instead see Paid with and None, it means your subscription will end on the date specified in Expires on.
Follow the prompts to turn off recurring billing. You'll have access to your subscription until it expires.
A:AnswerI had to call and cancel (1-800-433-5778), but it was relatively straight forward, even though I had next to no info (given it was several years since I signed up).