Tag Archives: repair ost with scanost tool

How to Fix the Error “Unable to Expand the Folder” in MS Outlook?

MS Outlook creates a mailbox which holds all the attachments and emails in various folders. To store mailbox data there are two types of files used on your local drive – Offline Storage Table (OST) file and other is Personal Storage Table (PST) file. You should use OST file to configure Outlook in offline mode. In OST file, all the offline work is store and synced with Exchange Server when it is connected to the internet.

Sometimes, it shows the following synchronization error –


Unable to expand the folder. There are errors in xxxx.ost file. The folders couldn’t be opened. Quit all the mailbox applications and use Inbox Repair tool.


If you get this type of error, there must be a problem in your OST file and it couldn’t get synced properly with Exchange Server. Some of the common reasons of OST file corruption are –

  • Exchange Server crash
  • Virus attack in OST file
  • Exchange Server Database Corruption
  • Mailbox deleted from Exchange Server


How to Fix?

As discussed in the error message, quit all the applications which might be using OST file.

  • Retrieve the repaired items.
  • Repair OST file by running scanpst.exe (Inbox Repair Tool).
  • Find OST file


In some cases, Inbox Repair Tool doesn’t repair OST file because this tool is not sufficient in complex scenarios of corruption in OST file. If it is not working, it is better to use OST Recovery tool for OST to PST file conversion. These tools can convert the files even in severe cases of OST corruption and recover all the OST file components, such as emails, contacts, attachments, notes, tasks, calendar entries, etc. After getting converted PST file, it can be saved to any storage media or disk and open it with Outlook directly.


Good thing about this software is that, you can use Free trial version. Free trial version will show you all the recoverable emails in preview items, where you can check your desire emails. And allow you to save some emails in Free version.

FREE Download and TRY:   Munual Guide to Repair OST file

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Manual Guide to Repair Corrupt OST File Through Free Integrated Scanost.exe Tool

Microsoft Outlook is one of the most widely used email clients as it comes with a lot of exciting features. MS Outlook stores the email files and information in Personal Storage Table (PST) and Offline Storage Table (OST) files. As the name suggests, Offline Storage Table is the format which enables users to work in offline mode when Outlook is not connected to Exchange Server.

All the offline data is stored and created in OST format when working without connection with Exchange Server. The best part of Outlook is that it enables users to modify the content offline and save changes in OST file, which is synced once it is connected to the server.

Sometimes, users cannot connect to Exchange server when using Outlook due to various errors that are unidentified and unknown. There are several reasons responsible for this failure, such as hard drive failure, unexpected system shutdown, virus attack etc. which damage OST file. Once this file is corrupt or damaged, you cannot access it and sync with Exchange server properly. In that case, you should use scanost.exe which is an Integrity Check Tool that comes with Outlook for free.


By default, this tool is located at C:\Program Files\Microsoft Office\Office_version. It performs integrity check of OST file. The best thing is that this tool doesn’t alter the hierarchy of mailbox. All it does is scanning the corrupt OST mailbox and attempts to fix the synchronization problems in OST file. It recreates the header of data file and resets the structure of the file to repair offline data. Make sure Outlook is connected to the server to start this tool. Here’s how to use this tool –

  • Close MS Outlook if it is open.
  • Browse scanost.exe at C:\Program Files\Microsoft Office\Office_version
  • Open scanost.exe
  • It will prompt you to choose a profile as per your setting in MS Outlook. Choose a profile which consists of corrupt file.
  • It has two options “Work Offline” and “Connect”. You have to click “Connect”.
  • Choose the “Repair Error” checkbox to repair the error with this tool. It will create a scan log without repairing it if you don’t select this box.
  • Click “Start Scan”
  • Open MS Outlook to view the scan log. In “Deleted Items” folder, click “OST Integrity check”.


What If Scanost.exe Doesn’t Work?

The Deleted Items folder also contains the items that cannot be repaired by this tool. If the error cannot be fixed with this tool, it is better to download OST to PST Converter software. It is a simple and easy to use OST to PST Converter that comes with exciting features along with OST to PST conversion. With few clicks, you can convert corrupt OST files into PST files and other formats like Office 365, MSG, EML, PDF, and HTML. You may download free trial version which allows conversion of 20 items in each folder from OST to PST files. You can easily convert all the mailbox items, such as emails, contacts etc. without any error.


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