How to fix OST Error 8004011d-526-80040115-0: A Helpful Guide

OST Error 8004011D-526-80040115-0 is a common error code that can occur in Microsoft Outlook, particularly in older versions like Outlook 2010, 2013, and 2016. It is often associated with issues related to the synchronization or connectivity between Outlook and Microsoft Exchange Server.

In this article, we would discuss the reasons and methods to repair Error 8004011D-526-80040115-0. For efficient and quick fixes IT Experts recommend Sysinfo OST Recovery Tool. This article will also cover the fundamental manual methods as well. Make sure to read until the end to discover the most dependable solution for you.

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Why OST Error 8004011D-526-80040115-0 is Caused?

OST Error 8004011D-526-80040115-0 code typically indicates that Outlook is having trouble connecting to the Exchange Server or there is a synchronization problem between the client and the server. It can be caused by various factors, including network connectivity issues, corrupt Outlook data files, incorrect settings, or problems with the Exchange Server itself. Some of the reasons for this error are:

  • File corruption of Outlook OST
  • Issues with Outlook Profile
  • Improper termination while synchronization process
  • Network issues
  • The server is unavailable or down

Methods to Repair OST Error 8004011D-526-80040115-0

The following section will discuss the various methods to fix OST Error 8004011D-526-80040115-0. These methods are reliable and verified by our Experts. The methods are as follows:

Method 1: Professional Way to Repair the Error

Sysinfo OST Recovery Tool is a comprehensive solution related to OST files. Users can utilize this tool to fix OST Error 8004011D-526-80040115-0. This tool is very reliable and has an easy GUI. It also maintains data Integrity. This software also offers users 3 recovery modes. Refer to the following steps to fix the error hassle-free.

  1. Firstly, install and Run the OST Recovery tool as an administrator.
  2. Click Open, and browse the OST file.
  3. Choose the desired Recovery mode.
  4. Additionally, check the optional features.
  5. Finally, select the mail and click Save and define the path.

By following these steps a user will be able to fix the error. For manual methods refer to the next method.

Method 2: Check Network Connectivity

Ensure that your computer has a stable internet connection and can communicate with the Exchange Server. Test other internet-dependent applications to verify that the issue is specific to Outlook.

If this solves your OST Error 8004011D-526-80040115-0 then, Congrats!!, or else refer to the next method.

Method 3: Restart Outlook

Sometimes, simple issues can be resolved by restarting the Outlook application. Close Outlook, wait for a few seconds, and then reopen it to see if the error persists.

However, if you still face a similar issue proceed to the next method.

Method 4: Update Outlook

Applications are updated to eliminate errors and bugs. It is always advised to keep the applications up-to-date for better performance and reliability.

Ensure that you are using the latest version of Microsoft Outlook. Updates often contain bug fixes and improvements that may address known issues, including error codes.

If even after updating the Outlook application the OST Error 8004011D-526-80040115-0 persists it is recommended to follow the next method.

Method 5: Repair Outlook Data Files

Outlook provides its users with in-built features to scan and repair the OST files. However, it may be insufficient since it cannot resolve complex errors.

Corrupted Outlook data files can cause synchronization problems. Use the built-in Inbox Repair Tool (scanpst.exe) to repair any corrupted Outlook data files.

Method 6: Check Exchange Server Status

If the problem persists, verify that the Exchange Server is running correctly and that there are no issues on the server side that could be causing the error.

If the server is live again and you still face OST Error 8004011D-526-80040115-0 then please proceed to the next method.

Method 7: Disable Antivirus/Firewall

Antivirus and firewalls are available to keep us protected, however, sometimes they block important applications.

Temporarily disable any third-party antivirus or firewall software on your computer, as they may sometimes interfere with Outlook’s connection to the Exchange Server.

Method 8: Recreate Outlook Profile

If all else fails, you can try creating a new Outlook profile and configure it to connect to the Exchange Server again. Sometimes, a corrupted profile can be the source of the problem. Users can recreate Outlook Profile with ease.

Please note that these are general troubleshooting steps and the specific solution may vary depending on the exact cause of the error. If you are not familiar with the technical aspects of Outlook or Exchange Server, it is advisable to use Sysinfo OST Recovery Tool.


Before parting our ways, let’s recap what we learned in this article. In this article, we have explained the various reasons and verified methods to repair OST Error 8004011D-526-80040115-0. The Manual methods are quite basic and inefficient. OST Recovery Tool is advisable for better results.

About The Author:

As a Technical Content Writer with two years of professional experience. I am deeply passionate about this field and constantly seek out the latest technologies and techniques to stay at the forefront of technological advancements. Through my writing, I aim to share valuable insights and practical knowledge on Email Migration and Data Recovery confidently.

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