Wondershare Repairit
Email Repair

Perfectly repair and recover corrupted Outlook PST & OST files.

  • Fix all Outlook Email issues on Windows and Mac in various scenarios.
  • One trick to fix corrupted PST & OST files in Outlook.
  • Restore Outlook Emails deleted for a long time and extract important Email messages, folders, calendars, etc.
  • Perfectly compatible with Windows & Mac devices.
email repair

The Comprehensive Guide to Repair OST File [All Versions]

The issue of OST file corruption is a critical concern for individuals and organizations relying on Outlook for email communication and data management. OST file corruption can occur for a variety of reasons, ranging from power outages and hardware failures to virus attacks and file size limits. It is essential for individuals to be aware of these potential causes and methods to effectively fix OST file corruption.

Part 1: Common Causes of OST File Corruption

corrupted ost file message

OST file corruption can occur due to a lot of reasons. It is vital for individuals to be aware of these reasons, as it can help them fix corrupt OST files efficiently.

1. Power Outages or Interruptions: Sudden power outages or interruptions during synchronization processes can lead to OST file corruption.

2. Hardware Failures: Malfunctions or bad sectors in hardware components can result in data corruption within the OST file.

3. Virus or Malware Attacks: Infections from malicious software can corrupt the OST file, potentially leading to data loss.

4. Software Conflicts or Compatibility Issues: Issues with email clients or third-party applications can disrupt the OST file's functioning and cause corruption.

5. Exceeding File Size Limit: Going over the maximum file size limit can corrupt the OST file, especially without proper management.

6. Improper Shutdown: Force closing the email client or system crashes can interrupt OST file operations and lead to corruption.

Part 2: Best Way to Fix Corrupt OST File in All Versions

  • Repair damaged PST & OST Files in Outlook in all Email corruption scenarios, such as hard disk crashes & bad sectors, virus attacks & tojan horse, outlook corruption & malfunctions, improper shutdown procedure, etc.

  • Restore Outlook Emails deleted for a long time and extract the Email messages, folders, calendars, etc. within seconds.

  • Repair corrupted Emails and restore deleted Emails with a 100% success rate.

  • Repair Emails in bathes without size limits and support to preview all of them before saving.

  • Compatible with Windows 7/8/8.1/10/11, Windows Server 2012/2016/2019, and MacOS X 10.11~ MacOS 12 (Monterey).

Utilizing an effective tool can prove beneficial in fixing corrupt OST files. Repairit for Email is the ultimate solution for repairing corrupt OST files, offering an unparalleled combination of advanced features and user-friendly functionality. Its robust algorithm meticulously scans and analyzes damaged OST files. With its intuitive interface, even novice users can effortlessly navigate the repair process. Here are the steps to fix corrupt OST file using the tool:

Step 1: Open the program and select the 'Find' option from the primary menu. Locate the corrupted OST file you wish to repair and click 'Repair.'

selecting the ost file to repair

Step 2: The software meticulously scans the selected OST file, meticulously examining its structure and contents. During this stage, Repairit identifies and repairs various types of corruption, ensuring its accurate restoration.

repairit scanning and repairing the corrupted file

Step 3: Once the scanning and repair processes are complete, you can preview the rectified data contained in the repaired file. Subsequently, you can select a suitable location and save the restored file by clicking the 'Save' button, ensuring the preservation of your recovered emails and attachments.

saving the repaired file

Repair Corrupt OST File with Repairit OST Fixer Now

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Part 3: 4 Manual Methods to Repair OST File

There are several methods that can be utilized to manually repair corrupt OST file. Many individuals have used these methods to repair OST files efficiently.

Fix 1: End All the Processes Working in the Task Manager

Before attempting any repair, ensure all processes related to your email client are closed to prevent conflicts. These are the steps to repair Outlook OST file using the tool:

Step 1: Press Ctrl + Shift + Esc to open the Task Manager.

task manager in windows

Step 2: Locate and select all processes related to your email client.

Step 3: Click on "End Task" for each selected process.

ending a process in windows

Step 4: Close the Task Manager and restart your email client to see if the issue is resolved.

Fix 2: Use the Scan PST Tool to Fix Outlook OST File

The Scan PST tool is a built-in utility that can help repair corrupted Outlook data files. The steps to fix OST file using this method are as follows:

Step 1: Close your email client and open the Control Panel.

control panel in windows

Step 2: Search for "Mail" and open the "Mail Setup - Outlook" window.

opening the mail setup-outlook window

Step 3: Click on "Data Files" and select the OST file you want to repair.

Step 4: Click on "Repair" to run the Scan PST tool and follow the on-screen instructions to fix any issues.

Fix 3: Start Outlook in Safe Mode

Starting Outlook in Safe Mode can help identify if any add-ins or settings are causing issues with the OST file. To use this method, please follow these steps:

Step 1: Press Win + R, type "Outlook /safe", and hit Enter to open Outlook in Safe Mode.

run dialog box in windows

Step 2: Check if the OST file works correctly in Safe Mode.

Step 3: If the issue is resolved, it might indicate a conflicting add-in or setting.

Step 4: Disable add-ins or troubleshoot settings to prevent future OST file problems.

Fix 4: Create a New Outlook Profile

Creating a new Outlook profile can sometimes resolve issues with the existing profile and OST file. Here are the steps to implement this method:

Step 1: Close Outlook and open the Control Panel.

Step 2: Search for "Mail" and open the "Mail Setup - Outlook" window.

mail option in control panel

Step 3: Click on "Show Profiles" and then "Add" to create a new Outlook profile.

Step 4: Set up your email account in the new profile and configure it to start using the new profile instead of the old one.

Part 4: Tips to Avoid OST File Corruption Issues

The chances of OST file corruption issues can be reduced by following a few essential precautionary measures. It is very important to take these precautionary measures on a time-to-time basis to avoid OST file corruption issues.

1. Regular Backup: Ensuring you have a copy of your data can help prevent OST file corruption.

2. Reliable Antivirus Software: Protect your system from malware to avoid potential OST file corruption.

3. Manage File Size Limit: Avoid exceeding the maximum file size to prevent OST file corruption.

4. Proper Shutdown: Closing your email client correctly can help prevent interruptions leading to OST file corruption.

5. Hardware Maintenance: Keep hardware components in good condition to reduce the risk of hardware-related file corruption.

6. Software Updates: Regularly update software for compatibility and stability to prevent software conflicts causing OST file corruption.


The issue of OST file corruption poses significant challenges for individuals and organizations relying on Outlook for email communication and data management. Individuals can take proactive measures to address and prevent potential issues by understanding the common causes of OST file corruption, implementing effective methods to repair OST file, and adhering to essential tips to avoid OST file corruption issues.

  • 1. What precautions should be taken before initiating the OST file repair process?

  • Before embarking on the OST file repair process, it is essential to implement certain precautions to safeguard the integrity of the data and minimize the risk of further complications. Users should create a backup of the corrupted OST file to preserve its current state and prevent any potential data loss during the repair procedure.

  • 2. Are there specific considerations for repairing OST files in a networked or enterprise environment?

  • In networked or enterprise environments, repairing OST files may entail additional considerations to align with organizational policies, security protocols, and collaborative workflows. IT administrators and system managers should adhere to established guidelines and procedures for managing OST file repairs within the network infrastructure.

  • 3. What resources and support channels are available for individuals seeking assistance with OST file repair?

  • For individuals seeking assistance with OST file repair, a variety of resources and support channels are accessible to provide guidance and technical expertise. Online forums and communities dedicated to Microsoft Outlook and Exchange server administration offer platforms for users to seek advice, share experiences, and receive recommendations for OST file repair solutions.