What adding an inbox means and when you need it

Adding an inbox in Outlook means connecting a second email account to the same Outlook window, so you can read and send from multiple addresses without switching between separate programs. You might do this if you have a work email and a personal email, or if you manage email for a small business alongside your own account.

Outlook stores each connected account in its own inbox folder on the left side of the screen. When you add an account, Outlook downloads your existing messages and then keeps checking for new mail from that address. The process takes about five minutes and works the same way whether you are using Outlook on Windows, Mac, or the web version.

Key Takeaways

  • You add a new inbox by opening Outlook settings, selecting "Accounts", and choosing "Add Account" — then entering the email address and password for the account you want to connect.
  • Outlook usually detects your email provider automatically and sets up the connection without asking you for technical details like server addresses.
  • If Outlook cannot detect your provider, you may need to enter server information manually or generate an app password instead of using your regular password.
  • Once the account is added, you can switch between inboxes by clicking each folder on the left side, or set up rules to sort incoming mail into specific folders.

Adding an account in Outlook on Windows

Open Outlook and look at the top left corner. Click File, then select Info from the menu on the left. You will see a button that says Add Account — click it.

A window will open asking for your email address. Type the full address of the account you want to add, then click Next. Outlook will try to find your email provider automatically. If it recognizes the provider (Gmail, Yahoo, Outlook.com, and most corporate email systems), it will ask for your password. Enter it and click Next again. Outlook will test the connection and finish setting up within a few seconds.

If Outlook does not recognize your provider, it will ask whether you want to set up the account manually. Click Yes and you will see fields for server addresses. If you do not know these details, contact your email provider or your IT department — they can give you the incoming and outgoing server addresses you need.

Adding an account in Outlook on Mac

Click Outlook in the menu bar at the very top of the screen, then select Preferences. Look for Accounts in the window that opens and click it. At the bottom of the accounts list, click the plus sign button.

A dialog box will appear. Select Email Account from the options shown. Type your email address in the field provided and click Continue. Outlook will attempt to detect your provider. If it succeeds, enter your password and click Add Account. If it does not recognize your provider, you will need to enter server information manually — ask your email provider for the incoming and outgoing server addresses.

Adding an account in Outlook on the web

Log into Outlook.com or your organization's Outlook web portal. Click the gear icon in the top right corner and select View all Outlook settings. On the left side, click Mail, then select Accounts.

Click Add another email account. Enter the email address you want to add and click Next. Outlook will ask for the password. After you enter it, the account will be added to your inbox list on the left side of the screen. You can now read and send from both addresses without leaving Outlook.

What to do if Outlook cannot connect

Some email providers require an app password instead of your regular password. This is common with Gmail and some corporate systems. If Outlook rejects your password after you have entered it correctly, your provider may require this extra step.

For Gmail, you will need to turn on two-step verification first, then generate a 16-character app password through your Google Account settings. For Microsoft work or school accounts, your IT department can tell you whether you need an app password. For other providers, contact their support team and ask whether Outlook needs a special password to connect.

If you still cannot connect after trying an app password, check that you have entered the email address exactly as it appears in your account settings — even a small typo will cause the connection to fail. You can also try removing the account and adding it again from the beginning.

Managing multiple inboxes once they are added

After you add a second account, you will see two inbox folders on the left side of Outlook — one for each email address. Click any inbox to read messages from that account. When you compose a new message, look for a From field that lets you choose which email address to send from. If you do not see it, click the From button in the compose window to make it appear.

You can create rules to sort incoming mail automatically. For example, you might send all messages from a specific sender to a folder, or flag messages with certain keywords. To set up a rule, right-click a message, select Rules, and choose Create Rule. Outlook will walk you through the options for that message type.

Removing an account you no longer need

If you want to stop using one of your connected accounts, you can remove it without deleting the email address itself. In Outlook on Windows, go to File > Info > Account Settings > Account Settings. Select the account you want to remove and click Remove. Outlook will ask you to confirm — click Yes.

On Mac, open Outlook > Preferences > Accounts, select the account, and click the minus sign button. On the web, go to Settings > Mail > Accounts, find the account, and click Delete. Removing an account from Outlook does not delete your email or close the account — it just stops Outlook from checking it.

Frequently Asked Questions

Can I add more than two email accounts to Outlook?

Yes. You can add as many accounts as you need. Each one will appear as a separate inbox folder on the left side. The process is the same for the third account as it was for the second — go to settings, click Add Account, and enter the email address and password.

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

No. Adding an account to Outlook only connects it — your emails stay on the original provider's servers. If you delete a message in Outlook, it will also be deleted from the original account, but adding the account itself does not remove anything.

What if I forgot the password for the account I want to add?

You will need to reset the password through the email provider's website before you can add it to Outlook. Go to the login page for that email service, click "Forgot password", and follow the steps to create a new one. Once you have reset it, you can add the account to Outlook using the new password.

Can I set one account as my default so messages send from it automatically?

Yes, but the method depends on your version of Outlook. In Outlook on Windows, go to File > Info > Account Settings > Account Settings, select the account you want as default, and click Set as Default. On Mac and the web, this option may not be available — you will need to manually select the account in the From field each time you compose a message.

Why is Outlook asking for a code when I try to add my account?

Your email provider is sending a security code to verify that you are the account owner. Check your email, phone, or authenticator app for a code (usually four to six digits), and enter it in the Outlook window. This extra step protects your account from unauthorized access.