Data Recovery Software

Data Recovery Tools

Hard Drive Recovery Software

All-in-One Data Recovery Tool

Get your lost data back after format or partition errors.



Buy Now

File Repair Tools

File Repair Tools

MOV Repair Tool

Complete Video Repair Tool kit

Repair your Unplayable Videos (MOV & MP4) securely



Buy Now

Outlook Tools

Outlook Tools

Outlook Backup and Migrate

Ultimate Outlook Backup Tool

Secure Way to Backup & Move emails & Contacts



Buy Now

Remo ONE

Remo ONE

Other Utilities

Other Remo Tools

Duplicate Photos Remover

Advanced Duplicate Photos Finder and Cleaner Tool

Find & Remove Duplicate Photos & increase disk space in 3 - Clicks!!



Buy Now


Fix Outlook Stuck in Verifying Data Integrity during Start-up

“Outlook stuck on verifying data” might be one of the errors that you might encounter usually when your Outlook application is starting up. You might experience this either while closing the Outlook application or while launching based on the cause of the error. Since the error is due to various reasons there is no specific method to fix this error. However, you can fix it based on the scenario you have encountered. With the information in this article you can fix when Outlook stuck on verifying data integrity, by helping you figure out the scenario.

Why is Outlook Stuck in Verifying Data Integrity?

Comparatively, “verifying data integrity” error is familiar to Outlook 2010 version and not so common on other versions. Frankly, there are various reasons for this error, the following are the most common reasons.

  • Oversized OST file
  • Abrupt Outlook termination
  • Malfunctioning of Add-ins
  • Corrupted Outlook data file

Since this error is mainly associated with an OST file it is suggested to set a backup of the OST file even before trying to fix the error. This backup of your Outlook data can be used when you tend to damage the OST file while trying to fix the errors. The best possible method for you to set backup of the OST file is through Remo Outlook Backup and Migrate. A holistic tool that is developed to Backup, Migrate and Restore Outlook data files. Download and install the Remo Outlook Backup and Migrate to launch the application. Select a smart scan and follow the instructions which will be mentioned clearly to set a backup. it is also completely free to set the backup so click on the download button right now..!

download now

Once you have set a backup now let’s figure out how to fix the error by disabling the verifying data integrity on Outlook. First let’s focus if you have come across the error while closing the Outlook application or while using the Outlook.

Fix Stuck in Verifying Data Integrity Outlook 2010, 2013, 2016

If your Outlook is stuck at verifying data while using or quitting the application, it is most probably due to damaged or malfunctioning add-ins. If add-ins are not the cause then it could be the result of an unstable internet connection.

In either case, the easy way out is to force quit the Outlook application using the task manager. It is recommended that you do not try abrupt Outlook termination by any other means as it directly affects the integrity of the Outlook data file OST. Outlook termination using task manager might act as an instant fix but not a permanent one, here are the steps:

Note: If you don’t have any add-ins installed or if your Outlook is stuck at verifying data while launching the Outlook application, you can completely skip this process.

  • Press Ctrl+Alt+Del or right click on the taskbar and select Task Manager
  • From the listed applications, select Outlook and click on End Task to force quit Outlook application.

Now open the Outlook application and see whether the error is fixed or not. You might also experience the error before closing due to malfunctioning Outlook Add-ins.

How to Fix Outlook Stuck in Verifying Data Integrity due to Faulty Add-ins.

If Outlook is stuck on verifying data integrity due to malfunctioning Add-ins, you will observe that Outlook does not close until all the Outlook related processes are terminated. To do that you need to force quit all the running Outlook related processes. The following are the steps to force quit running Outlook processes.

  • Launch Task Manager, click on more details to reveal all the background running processes
  • Scroll through the listed running programs, manually identify the running Outlook processes, select them, and click on the end task.

using safe mode to fix if outlook stuck in verifying data integrity

Relaunch the Outlook application in safe mode. In safe mode, Outlook runs only on basic essential firmware and blocks all the third party related add-ins. If Outlook application runs seamlessly in safe mode, it indicates that the third-party add-ins or plug-ins are responsible. Although painstaking you can disable each of the add-ins one by one in normal mode. Repeat this process until you find the add-in causing the error.

Forced quitting Outlook as mentioned above can also take a wrong turn and damage your Outlook data file. Safeguard your data by taking a backup of the OST file before any sort of troubleshooting. In just a few clicks, Remo automates finding the OST file, extracting all data stored on the OST file, and lastly creating a backup PST file.

Outlook Stuck in Verifying Data Integrity due to Large OST file

If you are not aware, OST file functions on the principle of synchronization. the file gives your Outlook some time to sync and wait until the process is completed.

In most cases, it should not take you more than 30 minutes to sync with respect to the size of the OST file. After synchronizing completely, your Outlook application must work normally. If a large OST file is causing the error, you better shrink the large OST file. If your Outlook is still stuck in verifying data integrity, it must be due to damages in the OST file or incorrectly terminated Outlook application.

Generally, problems associated with abrupt termination can be fixed by opening Outlook in safe mode. The following are the steps to open Outlook in safe mode.

  • Tap crtl+r to open the run dialogue box. In the run dialogue box type, “outlook /safe” and press enter.

If you have never unethically terminated your Outlook application, then the error is due to a damaged OST file.

How to Fix Outlook Stuck in Verifying Data Integrity due to Damaged OST File

The best possible solution for you in case of a damaged OST file is to convert it to PST file. Post converting to create a PST backup, uninstall and reinstall the Outlook application. Now import the PST backup file on to the reinstalled Outlook application. There are two possible ways to create a backup file.

  • Set a PST file backup using export and import wizard (manual and complex)
  • Convert OST file to PST using Remo OST to PST converter (Streamlined and secure)

However, manually recovering OST to PST is complex and time-consuming. Additionally, the file structure will not be the same if you manually export the OST data. so the most efficient way to backup the OST data is by using Remo OST to PST converter.

Ensure Data Integrity by converting Outlook OST to PST

Since Remo streamlines the entire conversion process it is simple to use. following are the steps to convert OST to PST using Remo OST to PST converter

download now

  • If you know the exact location of an OST file click on the Open OST file and select the file. If you are certain about the location click on Find OST file and leave it to the tool to search.
  • From the next screen click on find to locate the OST file and wait for the tool to locate the OST file. after locating the OST file, select the OST file and click on next.
  • Select the browse option and set a destination folder to save the PST file and click on Convert. It’s that simple, no need to select attributes manually; additionally, the tool is going to retain the exact folder structure which might not be possible if you manually export the PST file.

Steps to Fix the Outlook stuck in verifying Data integrity due to Damaged OST file

In the case of Damaged OST file then Outlook might refuse to sync the OST file with the online server resulting in the error. To fix the error you need to create a backup of the OST file by converting the OST file to PST. Using Remo will evade the errors in the OST file and create an error-free PST file. You can follow the steps mentioned in the previous section to convert OST to PST using Remo.

Once you have converted and taken the backup of the OST file now you can uninstall the Outlook application and reinstall it. Export the Outlook attributes from the error-free PST file and sync it with the Online server. Since it is a newly created backup file and Outlook is reinstalled there should not be any scope for verifying data integrity error in Outlook.

Default image
Tony Landry

Tony Landry is a Web Content Editor at Remo Software. He loves to write, edit, and manage content for users trying to troubleshoot and fix problems on Windows, Outlook, storage drives and Cloud storage networks.

He has published more than 200 articles in Remo Software blog. He actively engages in research and problem-solving techniques to consistently generate great web content. Fixing various hardware problems on computer and storage devices along with a great knack for fixing Outlook errors, Tony is also the fun-time IT guy for all his work friends. He lives in the San Francisco Bay Area and enjoys cycling.

Articles: 189

One comment

  1. Thanks for this recap. The command to use with the most recent version of Windows-10 as of 10-11-2021 is to press the Windows-key + R key and then type in outlook.exe /safe and then press enter-key.

Leave a Reply