If you get an email about unusual activity on your Microsoft account, or if you’re worried that someone else might have used your account, go to the Recent activity page.You’ll see when your Microsoft account was signed in during the last 30 days, along with any device or app-specific info.

You can insert a drop-down list of valid entries (also called a drop-down menu or drop-down box) in Excel to make data entry easier, or to limit entries to certain items that you define.

Learn how to manage your Microsoft devices. Add, remove, register, or rename a device on your Microsoft account.

Get a brief explanation about logging on as an administrator and making changes to other user accounts on your computer.

Microsoft Support offers assistance for Microsoft products, including how-to articles, videos, and training for various software and devices.

Contact groups, or distribution lists, are a fast way to send a message to multiple email recipients, especially groups you repeatedly contact.

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。

Learn how to redeem a gift card, code, or Office product key and spend your balance at Microsoft Store online, on Windows, or Xbox.

Obtenga información sobre cómo instalar, reinstalar o activar Microsoft 365 u Office 2019 en un equipo PC o Mac.

Explains how to resolve relay-prohibited errors in an Outlook account.