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Summary: Effortlessly resolve Outlook not syncing errors on Windows 10/11 with comprehensive solutions. From network troubleshooting to add-in management, these steps ensure efficient email and data synchronization in Microsoft Outlook..

For countless Outlook users, efficient email and personal information management have become integral to their daily routines. This versatile application not only handles emails but also manages tasks and events, enhancing productivity. However, when Outlook encounters syncing errors, it can disrupt work routines and jeopardize crucial data. The Outlook not syncing error on Windows 10 has been a common concern. To rectify this issue promptly, follow the solutions outlined below.

Causes behind the Outlook syncing issue

The disruption in synchronization between MS Outlook and a Windows 10 system can occur due to various factors, including:

  • Low or no internet connection
  • Working in the Offline mode
  • Incorrect settings
  • Incompatible add-ins and anti-virus software
  • Incorrect configuration of the Outlook profile
  • Interference from the Windows Defender
  • Severely corrupted Outlook PST files
  • Longer duration of email frequency
Consequences of the Outlook sync error

If the Outlook version on your Windows 10 is not syncing as it should, there are some alarming repercussions of it-

  • To begin with, users will continue to receive error messages, resulting in a constant interruption in the transfer of emails.
  • The automatic syncing of the data will also stop.
  • All the changes made in the offline mode will not be reflected when the user is back online.
  • Overall, all these factors, when combined, will result in a dip in the user’s productivity which further results in the company’s loss.
Techniques to solve Outlook not syncing error in Windows 10

Various factors can cause synchronization issues between Outlook and a Windows 10 system. Here, we present effective solutions to resolve this problem quickly.

Double check the internet connectivity

Poor internet connectivity can hinder Outlook’s performance. Ensure a stable and fast Wi-Fi connection, and consider using the web browser version of Outlook. If issues persist, switch to a more reliable network. You can check if you’re in Online or Offline mode to diagnose the problem.

  1. Launch the Outlook application and directly open the Send/Receive tab.
  2. Click on the Work Offline which is present on the extreme top right, to reconnect.Click on the Work Offline
Repair MS Outlook profile

An underlying issue with the Outlook profile itself can directly result in email syncing problems. Nevertheless, the Repair facility, which is available in Outlook, can be used to solve this quickly.

  1. In the Outlook application, click on the File tab.
  2. Move to Account Settings > Account Settings.Account Settings
  3. The Account Settings window will open. Select the email account having trouble and click on on Repair
  4. The repairing process will begin. Once it completes successfully, restart the application.restart the application
Turn off the Windows Defender

Windows Defender Security Center, included in Windows 10, might flag certain items as threats, causing syncing issues. Temporarily disable the software to see if it’s the culprit.

  1. On the Search bar, type Windows Defender Security Center.
  2. Select Firewall and network protection.
  3. Select the account and disable the software for it.
Disable trouble-causing extensions and anti-virus software

If you have installed extensions or antivirus programs that aren’t compatible with Outlook, disable them temporarily and check for improvements. While these programs are disabled, exercise caution when dealing with unknown links and emails.

  1. Open Outlook and straightaway open the File menu.
  2. From the left panel, click on on Options
  3. Now, go to the Add-ins tab. The Outlook Options window will appear.Add-ins tab
  4. Uncheck the extensions and out of the Manage options, select COM Add-ins. Now, click on COM Add-ins
  5. Restart the Outlook application.
Repair Microsoft Office

Sync errors can sometimes result from errors during the installation of MS Office. To address this, consider repairing the Office program.

  1. Go to the Control Panel of your system.
  2. Select Programs & Features.
  3. Locate MS Office from the complete list and right-click on it. Click on Change.
  4. Follow the instructions given on the screen.
Clear cache data

Cache files are designed to improve your search experience, but if they accumulate over time, they can slow down the system. You can also delete temporary Outlook files in Windows 10, which is essential for maintaining system performance.

  1. Close the Outlook program.
  2. Press the Windows and R keys together to open the Run dialog box.Press the Windows
  3. Type this command- %localappdata%/Microsoft/Outlook and press OK
  4. Select the files and right-click. Delete them.
Change the email sync frequency

The default email syncing interval in Outlook is set to 30 minutes, which may not be ideal for all users. You can adjust this interval to make the syncing process quicker.

  1. Click on the Send/Receive tab.
  2. Click on Sent/Receive Groups and select Define Send/Receive Groups.Define Send/Receive Groups
  3. You can change the time accordingly.change the time accordingly
Repair corrupted PST file

One of the primary causes of syncing issues in Outlook is a severely corrupted data file. Since Outlook stores all user information in PST format, corruption in this file can lead to syncing errors and data loss. To address this problem, consider using Kernel for Outlook PST Repair, a professional tool equipped with robust algorithms capable of efficiently repairing PST files of any size while preserving the original data hierarchy.


Outlook not syncing with a Windows 10 system has become a common issue with potentially significant consequences for organizations. It’s crucial to address this error promptly. This article explores various techniques to resolve the issue, including the use of professional utilities for move PST files containing confidential data. Explore these solutions to keep your Outlook and Windows 10 system running smoothly.

Kernel for Outlook PST Repair