Long delay to receiving mail on Outlook 365 Windows 11 Forum

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Before finding solutions, we suggest that users check their internet connection.



solve Office 365 mailbox sync delays

Incorrect Outlook settings can also be one of the reasons behind Outlook synchronization errors. The Support and Recovery Assistant, a tool provided by Microsoft, can identify and resolve common Outlook problems. It is capable of automatically FixTechGuide fix for stuck folders identifying problems with account setups, sync, and other typical mistakes. To solve your Outlook issues, download the application from the Microsoft website and follow the directions. Outlook’s ability to connect to the mail server may be blocked by firewalls or antivirus software.

solve Office 365 mailbox sync delays

Turn off Windows Defender Security Center



If there's a feature you think is missing from the Mail and Repair Outlook Profile Online Calendar apps, or if a feature in isn't working properly, you can provide feedback directly to the Mail and Calendar team. Two-factor authentication helps protect your account by making it more difficult for someone else to sign in. It verifies your identity using your password and a contact method (also known as security info). If you would like to ask me another question in the future or follow up on your current question, you can add me as a favorite Expert.



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



solve Office 365 mailbox sync delays

It is possible for a corrupted Outlook profile to impede synchronization. Test other programs or websites to be sure Outlook is the only problem. If the connection is poor, consider restarting your modem/router or moving to a more reliable network. If your password isn't the problem, you might have a certificate error. If so, you'll see a message that says, "There is a problem with the server's security certificate. The security certificate is not from a trusted certifying authority." Check with your email provider for instructions about how to create an app password for your email account.

Check Antivirus and Firewall Settings



  • Before we know the solutions, we will understand a few common causes of the Outlook sync problem.
  • Outlook’s ability to connect to the mail server may be blocked by firewalls or antivirus software.
  • If users are facing syncing issues in Outlook due to corrupt Outlook data files, they must choose a professional tool, like Shoviv OST to PST Converter Tool.
  • 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.


However, in some situations these processes can take up to 24 hours. We're in the process of migrating from On-Premise Exchange to O365. I recreate Outlook profile step by step have a couple of Users and a Shared Mailbox that were migrated and both Users are experiencing issues with the Shared Mailbox updating on a regular basis.

Free Methods to Remove Duplicate Items in Outlook 2016



If you're using an Exchange account that requires advanced settings, you'll need to remove the account and add it again using advanced settings. To add the account using advanced settings, see Add an account using advanced setup. Knowing the reasons behind the Outlook sync issues will help us to fix this problem and prevent issues in communication and workflow. If you still can't sync your email after removing your account and adding it again, you might need to add the account using advanced setup. If I check the sync log I see a lot of sync errors for Inbox, sent items and a few other folders.
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