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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 expert Outlook tips by FixTechGuide 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.  
  
  
  
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 sync help from FixTechGuide 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  
  
  
  
If your password is incorrect, you'll see a message asking you to update your password. If you're using an Outlook.com, Microsoft 365, or Exchange account, you won't have advanced mailbox settings unless the account was set up using advanced setup. The client has a computer off the domain at home that his work email is tied to and he has never had any of these issues in Cache mode with that device. Once you have completed the steps to fix Outlook sync errors, kindly check if the error has been fixed or not. There can be several reasons for the Outlook synchronization error. Before we know the solutions, we will understand a few common causes of the Outlook sync problem.  
  
Check Antivirus and Firewall Settings  
  
I’ve tried the Microsoft office uninstall tool provided by Microsoft (which deletes more items then just control panel uninstall).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.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.  
  
After you’re satisfied, turn off your firewall or antivirus program diagnose Office activation conflicts 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  
  
Check the software documentation to learn how to temporarily turn it off. There are various methods to resolve the Outlook sync issues, including manual and third-party solutions. Firstly, we will discuss a few manual methods to resolve this Outlook error and share the stepwise procedure of each method to successfully fix synchronization issues. Now, let us start with the manual processes to fix Outlook syncing errors. Firewalls and antivirus software might prevent you from syncing your email and calendar events. These syncing problems usually happen because of issues like a damaged Outlook profile, poor internet connection, or a corrupted OST file.