Long delay to receiving mail on Outlook 365 Windows 11 Forum

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Two-factor authentication helps protect your account by making it more difficult for someone else to sign in.



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 connection status shows disconnected 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.

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 recreate Outlook profile step by step connection.



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



solve Office 365 mailbox sync delays

Once the client started using Outlook again after some time has passed the issue had come back. I ran the PSTscan tool to check for anomalies on the OST file (which it found and repaired but the issue still occurs). I’ve tried to set cache mode from 1 year all the way down to a few days.

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.
  • 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.
  • Moreover, it maintains the folder hierarchy and metaproperties of the data when processing Outlook data files.
  • 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.


You'll have the option to do that on your "My Questions" page by clicking the heart icon labeled My Favorite. Please reply with your results when you have completed the steps above. Additionally, you might want to make a new profile and make it the default to see if it fixes the problem. However, his OST file is not anywhere near that size it’s about 5GB. I was wondering if anyone had some insight into an issue I am having with work offline mode stuck a client. The service typically takes less than 30 minutes to provision a user or to sync changes for a user.

Free Methods to Remove Duplicate Items in Outlook 2016



Here is the strange part I tried to remove the computer from the domain and have Outlook run from a local account for a few days. I’ve been in contact with Microsoft they had me migrate his account\data to another server this did not fix it. I’ve tried the Microsoft office uninstall tool provided by Microsoft (which deletes more items then just control panel uninstall).
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