Adding a mailbox to Outlook means connecting another email account so you can read and send from it without switching programs

You can add a second, third, or more email accounts to Outlook on your computer or phone. Once added, all your mailboxes appear in the left sidebar, and you can switch between them or read them all in one inbox. Outlook works with most email providers — Gmail, Yahoo, corporate accounts, and others — though the setup steps vary slightly depending on your email provider and which version of Outlook you use.

The process takes about five minutes and requires your email address and password. Some providers, like Gmail, ask you to create a special password just for Outlook rather than using your regular login. Once you add the account, Outlook downloads your existing emails and stays synced going forward.

Key Takeaways

  • You can add multiple email accounts to Outlook on Windows, Mac, or mobile devices, and they all appear in one program.
  • Gmail and Yahoo require you to generate a special app password in your account settings before Outlook can connect.
  • Outlook on the web (Outlook.com) and Outlook desktop (the Windows app or Mac version) have slightly different steps for adding accounts.
  • Once added, you can set which account sends by default and choose whether to combine all inboxes or keep them separate.

Adding an account to Outlook on Windows or Mac

Open Outlook and go to File > Add Account (on Windows) or Outlook > Preferences > Accounts (on Mac). Type in your email address and password, then click Next. Outlook will try to detect your email provider automatically and set up the connection.

If Outlook recognizes your provider, you are done — the account appears in your sidebar within seconds. If it does not recognize the provider, you may need to enter your mail server details manually. Your email provider's support page lists these details, usually labeled "IMAP" or "POP3" settings. Ask your IT department if this is a work email account.

For Gmail and Yahoo accounts, Outlook will ask you to create an app password instead of using your regular login password. This is a security feature. Go to your Gmail or Yahoo account settings, find the "App passwords" or "Generate app password" section, create one for Outlook, then paste that password into Outlook instead of your regular password.

Adding an account to Outlook on your phone

Open the Outlook mobile app and tap the menu icon (three horizontal lines) in the top left. Tap Settings, then Add Account. Type your email address and tap Continue. Enter your password and tap Sign In.

If you use Gmail or Yahoo, you may see a screen asking you to sign in through their website instead. This is normal — it means Outlook is directing you to create an app password. Follow the prompts, generate the app password in your Gmail or Yahoo settings, and paste it back into Outlook. The account syncs to your phone within a few minutes.

Adding an account to Outlook.com (web version)

Log into Outlook.com in your browser. Click the gear icon in the top right and select View all Outlook settings. Go to Mail > Accounts > Connected accounts. Click Connect another account, type your email address, and click Next.

Enter your password and click Sign in. If your provider requires an app password (Gmail, Yahoo), you will be directed to create one. Once connected, emails from that account appear in your Outlook.com inbox. You can also set it as your default sending address so replies come from that account by default.

What to do if Outlook cannot connect

If you see an error message, the most common cause is an incorrect password or a provider that requires an app password. Double-check that you typed your password correctly. If you use Gmail or Yahoo and have not created an app password yet, go back and create one — Outlook cannot connect to these services with your regular login.

If you still see an error, check whether your email provider blocks third-party apps. Some corporate email systems and government accounts do this intentionally. Contact your email provider's support or your IT department to ask whether Outlook is supported. They can also tell you the correct server settings if you need to enter them manually.

Choosing how your multiple accounts appear

Once you have added accounts, you can view them separately or combined. In Outlook on Windows or Mac, click View and look for inbox options. You can choose to see all inboxes in one combined view or switch between them using the sidebar. On mobile, swipe left and right to move between accounts, or tap the account name at the top to jump to a specific one.

You can also set which account sends by default. In Outlook settings, find Default Account or Sending Account and choose which email address replies and new messages should come from. If you forget to change it, you can always click the From line before sending and pick a different account.

Removing an account from Outlook

If you no longer want to check an email account in Outlook, you can remove it without deleting the account itself. On Windows, go to File > Account Settings > Account Settings, right-click the account, and click Remove. On Mac, go to Outlook > Preferences > Accounts, click the account, and click the minus sign.

On mobile, go to Settings > Accounts, swipe left on the account (iOS) or long-press it (Android), and tap Remove. Your email stays on the provider's servers — you are only removing it from Outlook. You can add it back anytime by repeating the steps above.

Frequently Asked Questions

Can I add a work email and personal email to the same Outlook?

Yes. You can add as many accounts as you want to one Outlook installation. They all appear in your sidebar, and you can switch between them or view them combined. Just make sure your work email provider allows third-party apps like Outlook — some corporate systems block them for security reasons.

Do I need to use the same password for all my accounts?

No. Each account uses its own password. If one account requires an app password (like Gmail), you create that app password just for that account. Your other accounts can use their regular passwords. Outlook stores each one separately.

What is an app password and why do Gmail and Yahoo need one?

An app password is a separate, temporary password you create in your email account settings. Gmail and Yahoo use it as a security measure — it lets you connect Outlook without giving Outlook your main password. You create it once in your email provider's settings, then paste it into Outlook. It only works for that app.

Will adding an account to Outlook delete emails from the original account?

No. Adding an account to Outlook only reads your emails — it does not change or delete anything on the provider's servers. Your emails stay where they are. If you remove the account from Outlook later, all your emails remain in your Gmail, Yahoo, or other email account.

Can I send emails from a different account than the one I signed into Outlook with?

Yes. Before you send, click the From line and choose which account to send from. You can also set a default sending account in Outlook settings so you do not have to change it every time. This is useful if you have a work email and personal email but want replies to go to your work address by default.