Learn how to tell if your Office software is genuine. To help determine if your Microsoft software is genuine, go to our How to Tell site for more information. Here you'll learn about authentic packaging, including what to look for with product key labels, and Certificate of Authenticity (COA), how to report counterfeit software, and find out what your shopping and licensing options are.

Identify guests on a team. To see if a team has any guests, just look below the heading where the team name shows up. You can tell if someone is a guest by looking anywhere their name appears—the word “Guest” appears after it.

Note: If you're using the default app bar configuration in the Microsoft Teams desktop app, use the commands in the table below.If you've changed the order of your apps or added additional apps, the command depends on the app's sequential order on the app bar. For example, if you've moved Calendar to the top of the app bar, press Ctrl+1 to open it, not Ctrl+4.

Set up your office phone number as your verification method. On the Additional security verification page, select Office phone from the Step 1: How should we contact you area, select your country or region from the drop-down list, type your office phone number, and then type your extension, if you have one.

Microsoft Authenticator backs up your account credentials and related app settings, such as the order of your accounts, to the cloud. You can then use the app to recover your information on a new device, potentially avoiding getting locked out or having to recreate accounts.

Type of account. Work or school account assigned by your organization and what you use to sign in to Microsoft 365 or Exchange Online at work or school. Microsoft account for accounts where Microsoft is the provider, such as an Outlook.com, Hotmail.com, Live.com, or MSN.com account. Third-party accounts such as a Google, iCloud, Yahoo, POP, or IMAP account

Join your work-owned Windows 10 device to your organization's network so you can access potentially restricted resources. What happens when you join your device

To sign in using a verification code with the Microsoft Authenticator app. If you use the Microsoft Authenticator app to get verification codes, then when you open the app you see a number under your account name.

了解如何接收从 Microsoft 购买的商品的退款或换货。

Azure MFA detects unusual activity like repeated sign-in attempts, and may prevent additional attempts to counter security threats. If you've mistakenly made many sign-in attempts, wait until you can try again, or use a different MFA method for sign-in. If you suspect someone else is trying to access your account, contact your administrator.