Please must remember your Microsoft account and password, otherwise, you won't be able to activate Office again if you forgot the account. Note: After signing-in, your product will be added to your Microsoft account, so that you can reinstall it later, or manage your new subscription without a product key. If you don’t have a Microsoft account yet, please select Create Account. Please sign in with a Microsoft account ① to activate it.

When you start an Office app for the first time, the system will inform “ You’ve got Office”.

Note: ASUS computer bundles with Microsoft 365, and if you have a one-time purchase of Office Home & Business (ex: Office 2021, or 2019), please follow the following steps to upgrade Microsoft 365 to Office 2021. The following activation process takes Office 2021 as an example: (The Office authority will be linked to your Microsoft account.)

You need to sign in with a Microsoft account.

You need to activate Office within 180 days from the time the Windows OS is activated.

Before you activate Office applications, Windows OS must be activated on your computer.

Note: If you had activated Office already and you need to reinstall it, please click here. Before activating Office, please check below Office regulations from Microsoft.

This article describes how to activate a one-time purchase version of Office Home & Business (ex: Office 2021, 2019, etc.), and you also can refer to the Microsoft’s Activate Office topic. How to activate one-time purchase Office Home & Business (ex: Office 2021, or 2019)

Microsoft office 365 product key 2021