How To Fix Outlook Syncing Issues?

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 modern authentication troubleshooting create an app password for your email account. 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. 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.

Methods to fix Microsoft Outlook syncing error

Test other programs or websites to be sure Outlook is the only problem. If the connection is poor, consider restarting your modem/router or moving to a more reliable network. If your password isn't the problem, you might have a certificate error.

Check your security software

• If this method doesn’t work for you, navigate to other solutions.
• 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 update from Azure AD Sync to Microsoft Entra Connect, see the upgrade instructions.
• The Support and Recovery Assistant, a tool provided by Microsoft, can identify and resolve common Outlook problems.
• There can be several reasons for the Outlook synchronization error.
• The other solution to fix Outlook sync issues is recreating Microsoft Outlook profile.

The causes of Fix Outlook and Office 365 Errors 2025 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 connection. Sometimes, Outlook sync issues can arise because of poor internet connection.

Free Methods to Remove Duplicate Items in Outlook 2016

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. Sometimes an error appears in the Mail and Calendar apps when the apps try to sync new email or calendar events. Incorrect Outlook settings can also be one of the reasons behind Outlook synchronization errors.

Reconfigure Server Settings

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. After you’re satisfied, turn off your firewall or antivirus program for a while. If it does, you might need to include Outlook exceptions in the settings of your security program. Users can also convert OST files into various file formats, including PST, HTML, EML, MSG, vCard, etc.

[Answered] Secured OST to PST Converter for OST to PST Conversion

If you are still facing this issue, kindly follow the solutions below to fix the sync issues in Outlook. Third-party firewalls or antivirus software might prevent you from syncing your email and calendar events. Check the software documentation to learn how to temporarily turn it off. These syncing problems usually happen because of issues like a damaged Outlook profile, poor internet connection, or a corrupted OST file.

Your account settings are out of date

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

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. Knowing the reasons behind the Outlook sync issues will help us to fix this problem and prevent issues in communication and repair PST file without data loss workflow. 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. 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.

How do I get Microsoft Entra Connect tool?

You'll also receive a mail (to the alternate email and to your admin email) from Microsoft 365 that indicates your tenant has encountered directory synchronization errors. For details see Identify directory synchronization errors in Microsoft 365. 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. I have multiple users experiencing sync errors with Outlook and office365.

If restarting Outlook or fixing the profile doesn’t work, converting the OST file is often the next step. EdbMails OST to PST Converter can help in these cases by recovering data from the inaccessible OST files and restoring them without data loss. Firewalls and antivirus software might prevent you from syncing your email and calendar events.