Fix Cannot Connect Office 365 Account to Apple Mail or Gmail
Question details
The user is unable to link an Office 365 mailbox to third-party email clients because the clients repeatedly reject the login credentials.
- Product
- Office 365 / Apple Mail / Gmail
- Device & OS
- not provided
- Scenario
- Attempting to retrieve or sync Office 365 emails using external mail clients like Apple Mail on Mac or Gmail via POP3/IMAP.
- Observed behavior
- Apple Mail and Gmail report an incorrect user ID or password and fail to connect to the Office 365 mailbox, despite the credentials being accurate.
Verify that you can successfully log in to Outlook on the web (OWA) with your Office 365 credentials to ensure your account is active and your password is correct before troubleshooting client settings.
Verify Office 365 Admin and Authentication Settings
Check with your Microsoft 365 Administrator to ensure that third-party app access and specific protocols (IMAP/POP) are enabled for your mailbox.
Microsoft has deprecated Basic Authentication for Exchange Online. If your email client is trying to connect using legacy authentication protocols, Office 365 will reject the login and display an 'incorrect password' error. Your client must support and use Modern Authentication (OAuth2).
Ask your Microsoft 365 admin to confirm that IMAP and POP access are enabled for your specific mailbox in the Exchange Admin Center.
Ensure that your organization's security defaults allow Modern Authentication and that legacy protocols haven't been entirely blocked if you rely on older client versions.
If you have Multi-Factor Authentication (MFA) enabled and are using an older mail client that does not support OAuth2, you must generate and use an 'App Password' instead of your regular Office 365 password.
Reconfigure the Account in Apple Mail
Remove and securely re-add your Office 365 account in Apple Mail to force the application to use updated server settings and OAuth tokens.
Update Gmail POP3 Retrieval Settings
Ensure your Gmail account is using the correct server names and encryption methods to retrieve Office 365 emails via POP3.
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Frequently Asked Questions
Why does Apple Mail say my Office 365 password is incorrect when I know it is right?
This error usually occurs because Microsoft requires Modern Authentication (OAuth2) for security, but the email client is trying to use legacy Basic Authentication. Removing the account in Apple Mail and re-adding it using the 'Microsoft Exchange' option typically fixes this by forcing Modern Authentication.
What are the correct IMAP settings for connecting to Office 365?
If you are configuring a client manually, the IMAP server should be 'outlook.office365.com' on Port 993, with TLS/SSL encryption enabled. The SMTP server is 'smtp.office365.com' on Port 587 with STARTTLS.
Can I still use Gmail to retrieve my Office 365 emails?
Yes, provided your Microsoft 365 IT administrator has not disabled POP3 access for your organization. You must use the POP3 server 'outlook.office365.com' on Port 995 with SSL checked in your Gmail settings.
Do I need an App Password to connect Office 365 to a third-party email client?
If your email client does not support Modern Authentication (OAuth2) and your organization enforces Multi-Factor Authentication (MFA), you will need to generate an App Password in your Microsoft account security settings to use as your password in the email client.
