Long delay to receiving mail on Outlook 365 Windows 11 Forum

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Sometimes, Outlook sync issues can arise because of poor internet connection.



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 expert Outlook tips by FixTechGuide 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



It also provides the option to export the Outlook OST file into Office 365 and Live Exchange mailboxes. This software also has a splitter option to split large-sized PST files into smaller ones, helping users prevent oversized PST file issues. Outlook sync issues can be because of corrupted Outlook OST or PST files. Therefore, now we will know the steps to repair the Outlook data file. We’ve work offline mode stuck had sync issues with employees from time to time however, re doing the mail profile or wiping the Windows profile usually fixes it. In some cases setting up a new computer replacement was the only option to fix these odd Outlook Sync issues.

solve Office 365 mailbox sync delays

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



  • It is capable of automatically identifying problems with account setups, sync, and other typical mistakes.
  • Users can also try its free demo version in their system and process the first 50 items from each folder freely.
  • Outlook sync issues can be because of corrupted Outlook OST or PST files.
  • If two-factor authentication is turned on for your account, you'll need to create an app password for that account.
  • Always make sure your profile and settings are set up correctly, your software is up to date, and your connection is steady.


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 FixTechGuide Outlook repair tutorial 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



The Mail and Calendar apps for Windows 10 don't support two-factor authentication. If two-factor authentication is turned on for your account, you'll need to create an app password for that account. An app password is used instead of your normal account password for apps that don't support two-factor authentication. Before you begin, make sure that your device has the latest operating system and app updates. Try the general troubleshooting solutions in Troubleshooting Mail and Calendar apps for Windows 10. I regret that you are experiencing issues with your Microsoft Outlook slow synchronizing inbox message, and need help speeding up.
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