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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. The other solution to fix Outlook sync issues is recreating Microsoft Outlook profile. Sometimes an error appears in the Mail and Calendar apps when the apps try to sync new email or calendar events.

The client has a computer off the domain at home that his work email is tied to and he has never had any credential loop in Microsoft 365 of these issues in Cache mode with that device. 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.

An app password is used instead of your normal account password for apps that don't support two-factor authentication.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.You'll have the option to do that on your "My Questions" page by clicking the heart icon labeled My Favorite.If there's a feature you think is missing from the Mail and Calendar apps, or if a feature in isn't working properly, you can provide feedback directly to the Mail and Calendar team.Check with your email provider for instructions about how to create an app password for your email account.However, his OST file is not anywhere near that size it’s about 5GB.If your password isn't the problem, you might have a certificate error.Now, we will verify the server settings to fix the Outlook synchronization error.

How to Fix Sync Issues in Outlook or OWA? – A Complete Guide

Check the software documentation to learn how to temporarily turn it off. Firewalls and antivirus software might prevent you from syncing your email and calendar events. There are various methods to resolve the Outlook sync issues, including manual and third-party solutions.

Professional automation to resolve Microsoft Outlook syncing issues

Before we know the solutions, we will understand a few common causes of the Outlook sync problem. The most common cause of an out-of-date account is an incorrect password.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.

Method 5: Fixing Sync Issues in Outlook Web Access (OWA)

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. I regret that you are experiencing issues with your Microsoft Outlook slow synchronizing inbox message, and need help speeding up.

Delays in provisioning of user/mailbox or synchronizing changes in Exchange Online

Now, we will verify the server settings to fix the Outlook synchronization error. 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.

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 Outlook Login Issues Troubleshooting 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.

Best Microsoft Office 365 Migration Tools in 2025

Once you have completed the steps to fix Outlook sync errors, kindly check if the error has been fixed or not. If your password isn't the problem, you might have a certificate error. If so, you'll see a message that says, "There is a problem with the server's security certificate. The security certificate is not from a trusted certifying authority." Check with your email provider for instructions about how to create an app password for your email account. If you can sync your email when the firewall is turned off, you'll need to allow the Mail and Calendar apps through the firewall. Windows Defender Security Center is free security software that's included with Windows 10.

The Support and Recovery Assistant, a tool provided by Microsoft, can identify and resolve common Outlook problems. It is capable Office 365 Sync Errors Fix of automatically 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. We’ve 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.

Reconfigure Server Settings

This blog talks about the causes behind Outlook synchronization errors and a few solutions to fix Outlook sync issues. We have shared five manual methods in this blog to resolve the Outlook syncing errors. Apart from this, we also discuss the Shoviv OST to PST Converter Tool, a professional way to repair, recover, and convert Outlook data files. This solution will be beneficial for users who are facing Outlook syncing issues because of corrupted PST or OST files.