The fastest way to add an Outlook mailbox
To add an Outlook mailbox in the Outlook desktop app or Outlook on the web, you need your email address and password. The app will usually find your account settings automatically — you enter your credentials, click a button, and Outlook handles the rest. If automatic setup fails, you may need to enter server details manually, but most personal Outlook accounts (those ending in @outlook.com, @hotmail.com, or @live.com) set up in seconds.
The steps differ slightly depending on whether you are using Outlook on Windows, Mac, or a phone, and whether you are setting up Outlook.com itself or connecting to an existing mailbox from another provider. This guide covers the most common scenario: adding an Outlook.com account to the Outlook desktop app or mobile app.
Key Takeaways
- Outlook.com accounts set up automatically in the Outlook app when you enter your email address and password.
- You can add multiple mailboxes to one Outlook app — each one appears as a separate account in your folder list.
- If automatic setup fails, check that your password is correct and that you have not enabled two-factor authentication without setting up an app password first.
- On phones and tablets, the Outlook mobile app works the same way as the desktop version and syncs your mailbox across all your devices.
Adding an Outlook.com account to the Windows or Mac desktop app
Open Outlook and look for the "File" menu (Windows) or the app menu at the top (Mac). Select "Add Account" or "New Account". A window will open asking for your email address — type in your full Outlook.com address and click "Connect" or "Next".
Outlook will prompt you for your password. Enter it and click "Sign in". If your account has two-factor authentication turned on, you may see a prompt asking you to verify your identity through another device or method — follow those steps. Once verified, Outlook downloads your mailbox folders and you are done. Your inbox will appear in the left sidebar under your account name.
If the automatic setup does not work, Outlook will offer an option to "Configure manually" or "Advanced options". This is where you enter server addresses if the automatic method fails. For Outlook.com accounts, the incoming server is imap.outlook.com (port 993) and the outgoing server is smtp.outlook.com (port 587). Both require encryption (TLS or SSL).
Adding an Outlook.com account to your phone or tablet
read the Outlook mobile app from the App Store (iPhone and iPad) or Google Play (Android). Open the app and tap "Add Account". Enter your email address and tap "Continue". You will then be asked for your password.
If two-factor authentication is on, you will receive a notification on another device asking you to approve the sign-in, or you may be asked to enter a code sent to your phone. Complete that step and your mailbox will sync to your phone. The Outlook mobile app shows your inbox, calendar, and contacts all in one place, and changes you make on your phone sync back to Outlook.com automatically.
What to do if automatic setup fails
The most common reason automatic setup fails is an incorrect password. Double-check that you are typing it correctly — passwords are case-sensitive. If you are not sure of your password, go to account.microsoft.com in a web browser, click "Security" in the left menu, and select "Change your password". Create a new password and try adding the account again in Outlook.
If you have two-factor authentication enabled on your account, Outlook may not accept your regular password. Instead, you need to create an app password — a separate, one-time password that Outlook can use. Go to account.microsoft.com, click "Security", find "App passwords", and generate one for Outlook. Use that app password instead of your regular password when adding the account to Outlook.
If you still see an error after checking your password and creating an app password, try signing out of Outlook completely and signing back in. On Windows, go to File > Account Settings > Account Settings, right-click your account, and select "Remove". Then add it again from scratch. On Mac, go to Outlook > Preferences > Accounts, select your account, and click the minus button to remove it before adding it again.
Adding multiple mailboxes to one Outlook app
You can add as many mailboxes as you want to a single Outlook app. Each one appears as a separate account in your folder list on the left side. To add a second account, follow the same steps as the first: go to File > Add Account (Windows) or the app menu > Add Account (Mac), enter the email address, and sign in.
When you have multiple accounts, you can switch between them by clicking on the account name in the left sidebar. You can also set Outlook to show all your inboxes in one view — on Windows, right-click "Inbox" and select "Show in Favorite Folders" for each account you want to see together. On Mac, drag each inbox to the Favorites section at the top of the folder list.
Connecting a non-Outlook email account
If you want to add a Gmail, Yahoo, or other non-Outlook email account to the Outlook app, the process is similar but may require extra steps. Enter your email address and password as usual. If automatic setup fails, you will need the incoming and outgoing server addresses for your email provider — these are usually found on the provider's website under "IMAP settings" or "POP3 settings".
For Gmail accounts specifically, you cannot use your regular Gmail password. Instead, go to myaccount.google.com, click "Security" in the left menu, and turn on "2-Step Verification" if it is not already on. Then scroll down to "App passwords", select "Mail" and "Windows Computer" (or your device type), and Google will generate a password. Use that password when adding your Gmail account to Outlook.
Syncing and troubleshooting across devices
Once you add an Outlook mailbox to the desktop app, that mailbox does not automatically appear on your phone — you need to add it separately in the Outlook mobile app. However, once you add it to both, they stay in sync. Emails you read on your phone will show as read on your desktop, and vice versa. Folders you create in one place appear in the other.
If your mailbox is not syncing between devices, check that you are signed in with the same Microsoft account on both. On your phone, open the Outlook app, tap the menu icon (three horizontal lines), and look for "Settings" — make sure the account listed there matches the one on your desktop. If you have removed and re-added your account recently, it may take a few minutes for sync to catch up.
Frequently Asked Questions
Can I add an Outlook mailbox without a password?
No, Outlook requires your password to verify that you own the account. If you have forgotten your password, reset it at account.microsoft.com before trying to add the account. If you have two-factor authentication on, you will also need to complete that verification step.
What is the difference between IMAP and POP3 when adding an account manually?
IMAP keeps your emails on the server and syncs them across all your devices — if you read an email on your phone, it shows as read on your desktop too. POP3 downloads emails to one device only and removes them from the server. For most people, IMAP is the better choice because it keeps everything in sync. Outlook uses IMAP by default for Outlook.com accounts.
Why does Outlook keep asking me to sign in again?
This usually means your password has changed or your session has expired. Sign in again with your current password. If it keeps happening, check that two-factor authentication is not blocking the connection — you may need to create an app password instead of using your regular password.
Can I add an Outlook mailbox to Outlook on the web without downloading anything?
Yes. Go to outlook.com in any web browser, click "Sign in", and enter your email address and password. You do not need to read or install anything. Outlook on the web works the same way as the desktop app but runs entirely in your browser.
What happens to my emails if I remove an account from Outlook?
Removing an account from Outlook only removes it from that app — your emails stay on the server at Outlook.com. You can add the account back to Outlook anytime and all your emails will still be there. Removing an account does not delete anything.