The Microsoft Authenticator app helps you sign into your accounts when you're using two-step verification.

Using Authenticator as a way to sign in If you have turned on passwordless, two-step, or multi-factor authentication for your account, use the following steps to sign-in: Go to the site where you want to sign in. Enter your username at the sign-in prompt and select Next. Select Send notification.

Learn how to add all your different accounts to the Microsoft Authenticator app.

Important: With two-step verification, you always need two forms of identification. This means that if you lose your phone, your password alone won't get you back into your account. For that reason, we strongly recommend you have three different sign-in methods associated with your account.

Learn how to show your contact information in your profile or limit what your contacts can view, by hiding your phone number, email, or both.

Learn how to set up your user account for multifactor authentication with Microsoft 365.

Outlook 網頁版 是組織使用的網頁版 Outlook，您可以透過網頁瀏覽器存取與公司或學校帳戶相關聯的電子郵件、行事曆和聯繫人。 您的公司或學校帳戶通常會由組織中的人員指派給您。

Learn how to block someone or add email addresses to the safe senders list in Outlook on the web.

如果無法登入您的 Outlook.com、Hotmail、Live 或 MSN 電子郵件帳戶，或者您不確定如何登入或登出，這裡提供一些解決方案。 如何登入您的Hotmail 或Outlook.com帳號 要登入 Outlook.com 或 Hotmail，你需要你的Microsoft帳號使用者名稱和密碼。 登入 故障排除：無法登入 Hotmail 或 Outlook.com Microsoft 會始終關注不常見的 ...

Learn how to download and install apps you need from your Microsoft 365 business subscription.