If Office activation fails, you'll see Unlicensed Product or Non-commercial use / Unlicensed Product in the title bar of your Office apps, and most features of Office are disabled. To restore all features of Office, you'll need to fix the problem that's causing activation to fail.

Learn how to download, install, and configure additional language packs for your version of Windows.

Microsoft 365 provides powerful tools to help organize you and your family's lives. Empower you and your family through the Microsoft 365 Family subscription and learn how to create family calendars, share notes with a family notebook on OneDrive, and connect with your family on Microsoft Teams.

Learn why it's important to have a backup, and how Windows Backup can help you keep your files and settings safe.

Learn how to view your PC information on Windows with Microsoft Support's step-by-step guide.

Improve your writing skills with Word's tools for spelling, grammar, and clarity. Find out how to check and correct errors in your documents.

By signing in with a Microsoft account, the new MSN allows you to personalize your experience on MSN.

Add additional privacy protection to email messages with encryption.

Microsoft アカウントにサインインするためのエイリアスを使用した Microsoft アカウントのメール アドレスまたは電話番号を変更する方法について説明します。

How to lock cells in Excel to protect your data. You can also unlock a range of cells and grant permissions to others to edit.