The diagnostic will guide troubleshoot Outlook synchronizing folders error 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 The most common cause of an out-of-date account is an incorrect password.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.

Turn off Windows Defender Security Center

If the size of your .ost file is close to the limit, you could try increasing the limit on your client, restart Outlook and see if there is any difference. Outlook Login Issues Troubleshooting I’ve unchecked download shared folders when setting up a new Outlook profile. After performing these steps, Outlook’s all folders will be synced to the server. If this method doesn’t work for you, navigate to other solutions. Select the button below to launch a diagnostic in the Microsoft 365 admin center.

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

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.
• Outlook’s ability to connect to the mail server may be blocked by firewalls or antivirus software.
• There can be several reasons for the Outlook synchronization error.
• Additionally, you might want to make a new profile and make it the default to see if it fixes the problem.
• There are various methods to resolve the Outlook sync issues, including manual and third-party solutions.
• 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.

After you’re satisfied, turn off your firewall or antivirus program modern authentication troubleshooting for a while. If it does, you might need to include Outlook exceptions in the settings of your security program. Now, we will verify the server settings to fix the Outlook synchronization error. After the files get repaired, restart the Outlook program to ensure that the Outlook syncing issues are resolved or not. I still have it turned on on my laptop and it has not shown any issues yet. However I do not use Outlook on it as much as I do on my desktop.

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.