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Fix sync issues in the Mail and Calendar apps in Windows 10

We're sorry you're having issues with the Mail and Calendar apps for Windows 10. To fix the problem, please try the following solutions in the order presented.

before you start

The first step is to make sure that you have the latest operating system and application updates on your device. Try the general troubleshooting solutions in Troubleshoot the Mail and Calendar apps for Windows 10. If this doesn't solve your problem, try the suggested solutions below.

Check the connection to your email server

If you're having trouble sending or receiving email, make sure you can access your email server.

  1. Verify that your computer is connected to the internet: You must have access to the Internet to send or receive e-mail. Make sure your device is connected to the internet.

  2. Trying to send email over the web Many email providers allow you to access your email through a website. Sign in to your email account on the website and confirm that this will allow you to send and receive email. If this is not possible, there may be a problem with your email server. Contact your email provider for assistance.

  3. Try sending an email from another application or device If you have another email app or computer / mobile device, try sending and receiving email using that app / device. If this is not possible, there may be a problem with your email server. Contact your email provider for assistance.

  4. Check the status of your e-mail server in cooperation with your e-mail provider If your email provider doesn't have a website and you can't set up your email system in another app or device, contact your email provider to verify that your email is on -Mail server can be accessed.

Check your security software

Firewalls and anti-virus software might prevent email and calendar events from synchronizing. While turning off security software permanently is not a good idea, temporarily turning off security software can help you see if it is preventing email or calendar events from syncing.

Note: If your device is connected to a network, your network's policy settings might prevent you from performing these steps. Contact your administrator for more information.

Deactivating the Windows Defender Security Center

Windows Defender Security Center is free software that comes with Windows 10. Unless you have additional security software installed, you should temporarily disable Windows Defender Security Center.

  1. Switch to begin and open that Windows Defender Security Center.

  2. Choose Firewall and network protection out.

  3. Open a network profile and turn off Windows Firewall for that profile. Repeat this step for each profile.

  4. If you can now sync your email, you need to allow the Mail and Calendar apps to access through the firewall. Follow the steps below.

IMPORTANT: Repeat the previous steps to re-enable the firewall for each network profile.

Allow the Mail and Calendar apps to access through Windows Firewall

If you can now sync your email with the firewall turned off, you will need to allow the Mail and Calendar apps to access through the firewall.

  1. Switch to begin and open that Windows Defender Security Center.

  2. Choose Firewall and network protection > Allow app access through firewall > Change settings out.

  3. In the list of allowed apps and features, select the check box next to Mail & Calendar, and select the check boxes in the Private and Public columns.

  4. Choose OK out.

Disabling third party security software

Third-party firewalls or antivirus software might prevent email and calendar events from synchronizing. While turning off security software permanently is not a good idea, temporarily turning off security software can help you see if it is preventing email or calendar events from syncing. Refer to the software documentation for information on how to temporarily disable the software.

WARNING: If you've turned off your antivirus software, don't open any email attachments or click links in messages from people you don't know.

Remove and re-add your account

In some cases, you can solve sync problems by removing your account from the Mail and Calendar apps and then adding it again.

  1. Switch to begin and open Mail.

  2. Select at the bottom of the left navigation bar out.

  3. Choose Manage accounts out.

  4. Select the account you want to remove, then choose Delete account from this device.

  5. Add the account again. For more information, see Set up email in Mail for Windows 10.

Remove and re-add your account using advanced setup

If you still can't sync your email after removing and re-adding your account, you may need to add the account using advanced setup. For more information, see Adding an Account Using Advanced Setup.

Check your advanced mailbox settings

If you're using a Google, Yahoo! Mail, iCloud, IMAP or POP3 account, check the settings under the advanced mailbox settings to make sure that these are configured according to the specifications of your email provider. If you're using an Outlook.com, Microsoft 365, or Exchange account, you won't have advanced mailbox settings unless the account was set up using advanced setup.

Obtaining the necessary information from your email provider

Before checking your advanced settings, check the website of your email provider or contact the email provider to find out the correct server settings. You will need the following information:

  • Address of the incoming and outgoing mail server

  • Incoming and outgoing mail server ports

  • Does the outgoing mail server require authentication?

  • Is the same username and password used for sending email?

    If the username and password are different, make sure you are using the correct username / password.

  • Does the incoming mail server require SSL?

  • Does the outgoing mail server require SSL?

  • Contact server (if applicable)

  • Calendar server (if applicable)

Check the advanced mailbox settings

  1. Switch to begin and open Mail.

  2. Select at the bottom of the left navigation bar out.

  3. Choose Manage accounts and then your email account.

  4. Choose Change mailbox synchronization settings > Advanced mailbox settings out.

  5. Make sure that the addresses and ports of the incoming and outgoing mail servers are correct.

  6. Uncheck the box next to Outgoing server requires authenticationif your provider does not require authentication.

  7. Uncheck the box next to Use the same username and password to send email, if your provider requires separate authentication for sending e-mail, and enter the username and password for the outgoing mail server.

    Hints: If applicable, change the following settings as well:

    • Check the box next to Requires SSL for incoming emailif your provider requires SSL for incoming emails.

    • Check the box next to SSL required for outgoing emailif your outbound email provider requires SSL.

    • Make sure the addresses for Contact server and Calendar server are correct.

If you're using an Exchange account that requires advanced settings, you'll need to remove the account and add it again with advanced settings. To add the account with advanced settings, see Adding an Account with Advanced Setup.

Check your privacy settings

  1. Switch to begin , and choose Settings > privacy > e-mail out.

  2. Make sure that Allow apps to access and send email on A is fixed.

  3. Choose calendar out.

  4. Make sure that Allow apps to access my calendar on A is fixed.

Verify that two-factor authentication is enabled for your account

Two-factor authentication is used to protect your account by making it harder for others to sign in. This is used to verify your identity using your password and a contact method (also known as security information).

The Mail and Calendar apps for Windows 10 don't support two-factor authentication. If two-factor authentication is enabled for your account, you'll need to create an app password for the account. An app password is used in place of your normal account password for apps that don't support two-factor authentication.

Contact your email provider for instructions on creating an app password for your email account.

You receive an error message while syncing email

Sometimes you will see an error message in the Mail and Calendar apps when the apps try to sync new email or calendar events. Here are some suggested solutions to the most common problems.

Your account settings are no longer up to date

The most common cause of an out of date account is an incorrect password. Select in the notification bar at the top of the app Repair account out. If the password is incorrect, you will see a message asking you to update your password. Enter the new password and select Finished out.

Tip: If you want to change the password for your account with your email provider such as Gmail or iCloud, you need to visit the website of the email provider. See Change Your Password for Mail for Windows 10 for more information.

If the password is not the problem, there may be a certificate error. If so, a message is displayed stating: "There is a problem with the server's security certificate. The security certificate is not from a trusted certification authority."

This error is common when you are not using SSL to secure your email account. To resolve this error, do the following:

  1. Select at the bottom of the left navigation bar out.

  2. Choose Manage accounts and then your email account.

  3. Choose Change mailbox synchronization settings > Advanced mailbox settings out.

  4. Make sure that the addresses and ports of the incoming and outgoing mail servers are correct.

  5. Check the boxes Requires SSL for incoming email and SSL required for outgoing email, and then select Finished > to save out.

This device does not meet the security requirements set by your email administrator

If you see this error message, see the device safety requirements article for troubleshooting steps.

0x80072726

An error 0x80072726 could be caused by a third-party firewall or antivirus software. While we don't recommend permanently disabling security software, you can go to the software manufacturer's website to see if they have workaround steps, or you can temporarily disable the software to see if that solves the problem. If so, contact the manufacturer's technical support for a way to access your email without disabling their software.

Warning: If you've turned off your antivirus software, don't open any email attachments or click links in messages from people you don't know.

Do you need more help?

Send us your feedback

We value your opinion. If there's a feature in the Mail and Calendar apps that you think is missing, or if a feature isn't working properly, you can send feedback directly to the Mail and Calendar team.

See also

Set up email in Mail for Windows 10