How to Fix macOS Mail App Not Syncing with Microsoft 365 Exchange After Password Change

Summary

This guide helps you troubleshoot and resolve: How to Fix macOS Mail App Not Syncing with Microsoft 365 Exchange After Password Change. Follow the steps below to fix the issue.

Common Causes

If you have recently changed your Microsoft 365 password, your macOS Mail app may stop syncing. This happens because the app is still using the old credentials to connect to the Exchange server. You will typically see an authentication error or find that emails are no longer sending or receiving. Follow these steps to update your account settings and restore sync.

Quick Fix Steps

1. Quit the Mail app completely.
2. Open System Settings and navigate to Internet Accounts.
3. Select your Microsoft Exchange account.
4. Click the Details button or select the account to view its settings.
5. Update the password to your new Microsoft 365 password.
6. Restart the Mail app and verify that emails are syncing.

Detailed Instructions

Update Your Password in Internet Accounts

1. Open the Apple menu and select System Settings.
2. Scroll down the left sidebar and click Internet Accounts.
3. In the list of accounts, select your Microsoft 365 or Exchange account.
4. Click Details or look for a password field to update your credentials.
5. Enter your new Microsoft 365 password and save the changes.

Re-Add Your Microsoft 365 Account (If Password Update Fails)

1. While still in Internet Accounts, click the + (plus) button.
2. Select Microsoft Exchange from the list of account types.
3. Enter your full email address and click Sign In.
4. When prompted, enter your new Microsoft 365 password.
5. Complete any Multi-Factor Authentication (MFA) prompts if they appear.
6. Ensure the Mail checkbox is selected, then click Done.

Troubleshooting

Account Still Not Syncing

• Ensure your Mac is connected to the internet.
• Open the Mail app, go to the Mailbox menu, and select Get All New Mail.
• Check that your Mac's date and time are set correctly in System Settings > General > Date & Time.

Password Prompt Keeps Appearing

• Open Keychain Access (found in /Applications/Utilities/).
• Search for your email address or "Exchange" in the search bar.
• Delete any old entries related to your Microsoft 365 account.
• Restart the Mail app and enter your new password when prompted.

If you use the same Microsoft 365 account on other devices, such as an iPhone or iPad, you will need to update the password on those devices as well.

If you have followed these steps and your mail is still not syncing, please Open a Ticket with our support team.

Still Having Issues?