Long delay to receiving mail on Outlook 365 Windows 11 Forum

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Try the general troubleshooting solutions in Troubleshooting Mail and Calendar apps for Windows 10.



solve Office 365 mailbox sync delays

The diagnostic will guide Microsoft Outlook Email Repair Tool Online you to resolve various error conditions that can cause mailboxes to not be created. The most common cause of an out-of-date account is an incorrect password. In the notification bar at the top of the app, select Fix account.

solve Office 365 mailbox sync delays

Turn off Windows Defender Security Center



Users can also try its free demo version in their system and process the first 50 items from each folder freely. Always make sure your profile and settings are set up correctly, your software is up to date, and your connection is steady. The causes of sync issues and local failures in Outlook are explained in this guide, along with practical troubleshooting and resolution techniques. You can extract and recover all of your mail items to a PST file using sophisticated OST File to PST Converter software if your OST file becomes unavailable or orphaned. Here, we will discuss the five manual methods to fix sync issues in Outlook or OWA. Before finding solutions, we suggest that users check their internet guide to Office 365 sign-in errors connection.

solve Office 365 mailbox sync delays

Check if two-factor authentication is turned on for your account



solve Office 365 mailbox sync delays

If your password is incorrect, you'll see a message asking you to update your password. 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. The client has a computer off the domain at home that his work email is tied to and he has never had any of these issues in Cache mode with that device. Once you have completed the steps to fix Outlook sync errors, kindly check if the error has been fixed or not. There can be several reasons for the Outlook synchronization error. Before we know the solutions, we will understand a few common causes of the Outlook sync problem.

Check Antivirus and Firewall Settings



  • Before we know the solutions, we will understand a few common causes of the Outlook sync problem.
  • There can be several reasons for the Outlook synchronization error.
  • There are various methods to resolve the Outlook sync issues, including manual and third-party solutions.
  • The Mail and Calendar apps for Windows 10 don't support two-factor authentication.
  • Now, we will verify the server settings to fix the Outlook synchronization error.
  • I’ve unchecked download shared folders when setting up a new Outlook profile.


If you can sync your email when the firewall is turned off, you'll need to allow the Outlook Not Sending or Receiving Email Mail and Calendar apps through the firewall. Windows Defender Security Center is free security software that's included with Windows 10. If you haven't installed alternative security software, you should temporarily turn off Windows Defender Security Center.

Free Methods to Remove Duplicate Items in Outlook 2016



Check the software documentation to learn how to temporarily turn it off. There are various methods to resolve the Outlook sync issues, including manual and third-party solutions. Firstly, we will discuss a few manual methods to resolve this Outlook error and share the stepwise procedure of each method to successfully fix synchronization issues. Now, let us start with the manual processes to fix Outlook syncing errors. Firewalls and antivirus software might prevent you from syncing your email and calendar events. These syncing problems usually happen because of issues like a damaged Outlook profile, poor internet connection, or a corrupted OST file.
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