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Use your Microsoft account to sign in to Microsoft services like Windows, Microsoft 365, OneDrive, Skype, Outlook, and Xbox Live.

Applies To: Microsoft 365 for home, Outlook.com, Microsoft 365 for Mac, Microsoft 365 for Windows, Microsoft account dashboard, Microsoft Edge, Microsoft Teams, OneDrive (home or personal), OneDrive for Mac, OneDrive for Windows

If your purchase of Office or Microsoft 365 came with a product key, you enter your product key on one of the websites listed below for your product.

Applies To: Office 2021, Office 2021 for Mac, Office 2019, Office 2019 for Mac, Office 2016, Microsoft 365 for home, Office for business

Learn how to troubleshoot and fix problems setting up your email in Outlook.

Applies To: Outlook for Microsoft 365, Outlook 2021, Outlook 2019, Outlook 2016, Microsoft 365 admin

Fresh Start in Windows 10 lets you perform a clean reinstallation and update of Windows while keeping your personal data and most Windows settings intact.

Learn how to use function VLOOKUP in Excel to find data in a table or range by row. Our step-by-step guide makes vlookup in excel easy and efficient.

Applies To: Excel for Microsoft 365, Excel for Microsoft 365 for Mac, Excel for the web, Excel 2021, Excel 2021 for Mac, Excel 2019, Excel 2019 for Mac, Excel 2016

Discover the latest features in Office 2021, including new ways to create content, manage data, and communicate effectively.

Applies To: Office 2021, Office 2021 for Mac

忘れた場合や紛失した場合に Windows パスワードを変更またはリセットする方法について説明します。

Remote Assistance and Easy Connect let someone you trust take over your Windows 10 PC and fix a problem from wherever they are.

Learn how to use virus and threat protection options in Windows Security to scan your device for threats and view the results.

Applies To: Microsoft account dashboard

Learn how to redeem a Microsoft/Xbox gift card or other code on your mobile device, Windows device, or Xbox console.