When you enable an add-in, it adds custom commands and new features to Microsoft 365 programs that help increase your productivity. Because add-ins can be used by attackers to do harm to your computer, you can use add-in security settings to help protect yourself.

Select Start , then select Settings > Personalization > Themes.Choose from a default theme or select Get more themes in Microsoft Store if you want to download new themes with desktop backgrounds that feature cute critters, breathtaking landscapes, and other smile-inducing options.

注: 職場または学校アカウントではなく、 Outlook.com、Hotmail、Live、MSN のメール アカウントなどの Microsoft アカウントでサインインした場合は、サインアウトしてから、正しいアカウントを使用してもう一度サインインします。 サインインしているアカウントがわからない場合 Outlook ...

Remarque : Si vous vous êtes connecté avec un compte Microsoft tel qu’un compte de messagerie Outlook.com, Hotmail, Live ou MSN au lieu de votre compte professionnel ou scolaire, déconnectez-vous, puis reconnectez-vous à l’aide du compte approprié. Vous ne savez pas avec quel compte vous êtes connecté ? Sélectionnez Gestionnaire de compte dans l’en-tête de navigation Outlook.

The IFS function checks whether one or more conditions are met and returns a value that corresponds to the first TRUE condition. IFS will allow you to include up to 127 pairs of conditions (the test if something is True and the result if something is true). IFS can take the place of multiple nested IF statements.

Windows 11 のライセンス認証を行う場合は、「 Windows のライセンス認証を行う」を参照してください。

To enhance your Microsoft 365 experience in new Outlook for Windows, Outlook.com, Outlook for iOS, Outlook for Android, and new Outlook for Mac, you can now sync your non-Microsoft accounts (including their emails, contacts, and events) to the Microsoft Cloud.

Tip: If you're a Microsoft 365 Family or Personal subscriber you get Microsoft Defender, our advanced security software for Windows, Mac, iOS, and Android, as part of your subscription.Learn more at Getting started with Microsoft Defender.

Learn how to switch Outlook from working offline to online with your mail server on Microsoft Support.

Find out how to use Game Bar to capture game play, chat with friends, track achievements, and more.