My product key isn't working. If your Office product key doesn’t work, or has stopped working, you should contact the seller and request a refund. If you bought a product key separate from the software, it’s very possible the product key was stolen or otherwise fraudulently obtained, and subsequently blocked for use.

スライド マスターとは 記事; PowerPoint でスライドの追加、配置変更、複製、削除を行う 記事; スライド レイアウトを適用する

How to add a signature to your Word documents. You can also use the Signature Line command in Word to insert a line to show where to sign a document.

Windows 11, version 23H2 ; July 25, 2024—KB5040527 (OS Builds 22621.3958 and 22631.3958) Preview; July 9, 2024—KB5040442 (OS Builds 22621.3880 and 22631.3880)

Use Microsoft Teams (work or school) for a Microsoft work or school account or a guest account in Windows 11. Also, find out which version of Teams you’re using.

Learn how to add a printer or scanner in Windows. If your printer connects by a wire, plug it into your device. It'll connect automatically, your PC will download the right drivers, and you can use it right away.

Contact Microsoft Support. Find solutions to common problems, or get help from a support agent.

OneDrive でアップロードとダウンロードを停止、キャンセル、または一時停止する方法について説明します。

How to freeze panes in Excel to keep rows or columns in your worksheet visible while you scroll, or lock them in place to create multiple worksheet areas.

[設定] の [Windows Update] ページにアクセスするための推奨オプションなど、Windows 11 をインストールする方法をご覧ください。