Improve my PC performance in Windows - Microsoft Support
If your Windows 10 PC is running slowly, there are some solutions you can try to help make it run better.
複数のセルのテキストを 1 つのセルに結合する - Microsoft サポート
2 つ以上のセルのテキストまたはデータを Excel の 1 つのセルに結合する方法。
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, Excel Mobile
Fix USB-C problems in Windows - Microsoft Support
Learn how to troubleshoot USB-C problems in Windows and fix USB devices, ports, and adapters not working properly.
Insert a signature - Microsoft Support
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.
Applies To:
Word for Microsoft 365, Word for Microsoft 365 for Mac, Word 2021, Word 2021 for Mac, Word 2019, Word 2019 for Mac, Word 2016
Sign-in options in Windows - Microsoft Support
Learn about the sign-in options in Windows settings.
Add and request read receipts and delivery notifications in Outlook ...
How to add and request read receipts and delivery notifications in Outlook.
Applies To:
Outlook for Microsoft 365, Outlook 2021, Outlook 2019, Outlook 2016, Outlook on the web, Outlook.com, New Outlook for Windows, Outlook on the web for Exchange Server 2016, Outlook on the web for Exchange Server 2019
Windows のライセンス認証を行う - Microsoft サポート
プロダクト キーまたはデジタル ライセンスを使用して Windows をライセンス認証し、ライセンス認証の状態を確認し、Microsoft アカウントをリンクする方法について説明します。
Reset a forgotten Microsoft account password
Learn how to reset or change your Microsoft account password. Get help with a forgotten Microsoft account password.
Applies To:
Microsoft account dashboard
Product activation for Windows – online & support telephone numbers
Activation helps verify that your copy of Windows is genuine and hasn’t been used on more devices than the Microsoft Software License Terms allow. There are three methods to which you can activate your product: Online via the internet, by telephone using our automated systems, and by a live support advocate.
Upgrade to Windows 10: FAQ - Microsoft Support
Learn how to upgrade your existing device to Windows 10 or buy a new PC. Get answers to common questions about upgrading to Windows 10.