Some Office pre-installed PC in Japan will include an Office 2021 license as well as a Microsoft 365 Basic 12 month free subscription offer.
And, some Office pre-installed PC include a Microsoft 365 Basic 12 months free subscription offer only.
The Microsoft 365 Basic subscription offer is a digital product as well as other Office 2021 or Microsoft 365 license included with your device. For example, if you purchase a PC with a Microsoft 365 Basic offer, you can find the Microsoft 365 Basic 12-month free under the "Included with device" tab in the Library in the Microsoft store app.
If you want to start the subscription, you should perform the steps in the Microsoft store app following below.
Important: The subscription offer will be expired if you will not start it within 180 days after the Windows is activated on your device. So, be sure to start it as soon possible. If you want to make sure the expiration date, you can make sure it in the Microsoft 365 Basic offer shown under the "Included with device" tab in the Microsoft store app.
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Start the Microsoft store app on your device
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Sign into the app with your Microsoft account
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Select the Library icon > Included with device tab to see the Microsoft 365 Basic | 12-month Subscription
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Select the Claim button in it
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The Subscribe dialog opens with the string, "To get started, add a payment instrument" (If the dialog with this string opens, go to Step 6 and 7 to add a payment instrument in your Microsoft account. If you have already added a payment instrument in your Microsoft account, go to Step 8.)
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Select Next button in it
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Enter your payment instrument information and select Save button
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The Subscribe dialog opens with your payment instrument
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Select the Subscribe button
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The Success! dialog opens
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Select the Done button in it
After the steps, the 12 months subscription will start with your Microsoft account from the day.
You can use the services of the Microsoft 365 Basic on your multiple devices. If you want to check the status of your subscription, please visit the "Services and subscriptions" in the Microsoft account dashboard.
Note: This subscription will start with recurring billing turned on by default. After the first year, you will be billed for next 12 months subscription and your subscription will be extended automatically. If you want to turn the recurring billing off, see the article and turn the recurring billing off in your Microsoft account dashboard.
See also
Activate an Office purchase or free offer on a new PC