Converts Damaged OST due to Large Size

  • A top-notch application that fixes damaged OST due to file oversize issues with MS Outlook
  • The program securely converts the large-sized OST files to PST data files in simple clicks
  • Offers a convenient mechanism to fix errors and corruptions with the OST and PST files
  • Works efficiently with all versions of Microsoft Outlook email


OST is an offline storage table file used by Microsoft Exchange Server that allows the user to access emails even when the mail server access is not available. While the user’s email and other Outlook data saved on the mail server; the OST is an option that enables the user to save a local copy of the data on user’s computer. When the Outlook is connected to Exchange server, then all the items from OST file are automatically synced with the mail server. Suppose your OST file is corrupted due to a huge amount of data stored on it or any other reason, then you cannot access data from it. In this case, you need to convert a large OST to PST, to access all the information available in corrupted OST file.

Reasons for OST file corruption:

Oversized OST: There is a size limit to save data on OST file of any Outlook version. When the OST file reached its maximum size or more than this, then it will get damaged. To get back all lost Outlook information, you need to convert large OST to PST file.

Virus Attack: There are some viruses responsible to cause OST file corruption and makes it completely inaccessible to the user. Therefore always make use of quality antivirus software to ward -off your computer from such issues.

Sudden Outlook Termination: Generally, the user quit Outlook by saving all their work and then clicking on “Exit” option. However, if it is closed abruptly, then the OST file may become corrupt. In such situation, the large OST to PST converter can save your data.

Synchronization Error: The interruptions during synchronization of OST file and Exchange server causes OST file corruption. Sometimes it leads to deletion of PST files due to improper synchronization. In such cases, you need to recover those PST files using some recovery tools. In this instance, if you use some unreliable tools to recover deleted or lost files then you may end up in the corrupted PST files. At that time, you may require a tool to repair recovered PST files.

When you try to open the corrupt OST file, you may get the following errors:

  • Cannot open your file xxx.ost
  • Errors have been detected in OST file, quit the application and use Outlook inbox repair tool
  • Cannot open Outlook items when Offline

To overcome from such errors, one can use inbuilt OST integrity checker tool (Scanost.exe) to repair OST file. This tool detects errors and repairs OST file with its copy in the Exchange Server. However, it is not always possible to fix OST file using this inbuilt tool. In that case, you need to convert a large Outlook OST to PST using an efficient OST to PST converter software. By using this software, you can convert OST to PST on Outlook 2003, 2007, 2010, 2013, 2016 etc.

This software will help you to scan corrupt OST file and extract all emails, contacts, attachments, etc and they are stored in a new accessible PST file format. One can also get more details on how to convert the mailbox to PST by visiting here - It can convert large outlook OST to PST with the all original data intact.

With the help of this large OST to PST converter, you can recover all items lost due to oversized OST file. It can convert large Outlook OST to PST, even if it is password protected or encrypted. For more information on how to convert corrupt OST to PST, one can click here - The large OST to PST converter is very simple to use since the interface is self-descriptive and user-friendly.

Steps to Convert Damaged OST due to Large Size

Step 1: Select “OPEN OST FILE” option from the main page as shown in Fig 1.

Convert Large OST to PST - Main Window

Figure 1: Main Window


Step 2: Select the OST file that needs to be converted, using the “Browse” option and then click on the “Next” button as shown in Fig 2.

Convert Large OST to PST - Select OST File

Figure 2: Select OST File

Step 3: Select the destination path where you want to save converted file and then click on the “Convert” button as shown in Fig 3.

Convert Large OST to PST - Select Destination Path

Figure 3: Select Destination Path

Step 4: Once the conversion process is completed, you can see the message “OST file conversion completed” as shown in Fig 4.

Convert Large OST to PST - OST file conversion completed

Figure 4: OST file conversion completed