Long delay to receiving mail on Outlook 365 Windows 11 Forum

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I’m at wits end and Microsoft stopped helping me because they feel the problem is on our end.



solve Office 365 mailbox sync delays

Sometimes, Outlook sync issues can arise because of poor internet connection. If you are still facing this issue, kindly follow the solutions below to fix the sync issues in FixTechGuide email error solutions Outlook. 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.



Turn off Windows Defender Security Center



If there's a feature you think is missing from the Mail and Outlook Stuck on Synchronizing Folders 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.

solve Office 365 mailbox sync delays

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



solve Office 365 mailbox sync delays

Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. These are the only two I've seen have this issue and I was wondering if you've seen this and figured out a 'fix'? Tempted to create a Test Shared Mailbox, but thinking that wouldn't be an accurate test for inbound mail, etc. or just actually tested by the Users at all.

Check Antivirus and Firewall Settings



  • EdbMails OST to PST Converter can help in these cases by recovering data from the inaccessible OST files and restoring them without data loss.
  • Incorrect Outlook settings can also be one of the reasons behind Outlook synchronization errors.
  • I’m at wits end and Microsoft stopped helping me because they feel the problem is on our end.
  • It verifies your identity using your password and a contact method (also known as security info).
  • Once the client started using Outlook again after some time has passed the issue had come back.
  • Here, we will discuss the five manual methods to fix sync issues in Outlook or OWA.
  • To fix the issue, please try each of the following solutions in order.
  • 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 you can sync your email when the firewall is turned off, you'll need to allow the Microsoft Outlook Email Repair Tool Online 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



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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