Outlook OST File Cannot be Opened Windows 10

Outlook OST File Cannot Be Opened in Windows 10 Error [100% Resolved]

Error Solution

You must have got an error at the time accessing Outlook 2019, 2016, 2013, 2010 and 2007, displaying the “OST file cannot be opened in Windows 10” error message on the screen.

Well, that’s why you are here! You must agree that the first thought that comes to your mind in such scenarios is to instantly close & re-open MS Outlook. Or perhaps you also thought to run the Outlook in safe mode, which can be done just by clicking on the start button and running MS Outlook.exe.

However, does this resolve the issue? Maybe sometimes, but not always.

So, now the question is how to fix this unable to open OST file error? Is there any manual way?

The answer is YES! Today, in this article, we are going to put some light on how to resolve the OST file that can’t be opened in Windows 10 error.

Instant Fix: To resolve Outlook 2019, 2016, 2013, 2010 and 2007 OST file cannot be opened error quickly. Download and use OST File to PST file converter tool to fix issue in OST file.

Download OST to PST Converter

We will learn that there are two methods to do so, including manual and automated. However, before that, let’s go through some crucial things that you must know.

A Brief Introduction on PST and OST File Formats

Before getting ahead, it’s quite crucial to know about Microsoft Outlook and its associated file formats. It is the generally utilized email client across the globe in the companies by the technical folks. MS Outlook consists of two file formats, including PST and OST.

Offline Storage File is commonly called as OST. Usually, it is built while the connection between the Microsoft Outlook and Exchange account is recognized. It lets the users operate in an offline mode as well by using cached data. But the PST file is a Personal Storage Table, which simply saves the entire data items of Microsoft Outlook in it. PST saves all contacts, tasks, email messages, calendar, attachments, and more.

Common Issues Associated with Outlook OST File

In case, you are an MS Outlook user, you must be familiar with the Outlook OST data file. Therefore, there are probabilities that you might face with the issue the OST can’t be opened. The multiple issues, which are quite ordinary are:

Benefits of OST Data File

  • OST data files are accessible even if restricted or no Internet connectivity.
  • Users can use their mandatory data if Exchange Server crash/Exchange Server downtime.
  • Users can work offline without any internet connectivity.
  • OST files can be utilized as a backup data file to save the data if the MS Exchange Server turns out to be inaccessible.

Why You Get “OST File Cannot Be Opened” Error: Key Reasons

There are a lot of feasible reasons that are going to make Offline Storage Table file get damaged or corrupted. Here are a few obvious reasons that trigger this error:

  • Hard Drive’s Bad Sectors: Existing of bad sectors on your hard drive where your OST data files are saved could direct you to the remoteness of OST data files.
  • Power Failure: Unexpected power failure while users are functioning with the Outlook OST could consequence in OST file damage or corruption.
  • Unanticipated Shut Down of Outlook: In case, MS Outlook dismisses abruptly, then Outlook OST might damage or develop inaccessible. As a result, to overcome such a problem, you require to close the MS Outlook after you are done your tasks.
  • Malware Attack or Virus: Malware or virus attack is the other reason to corrupt the MS OST file. Therefore, it is suggested to install a trusted and consistent anti-virus system in your device.
  • Synchronization Problem: The synchronization amid the OST file, as well as the MS Exchange server, might even lead you to a lot of OST errors. Henceforth, it is recommended to opt for an appropriate network connection.
  • Unanticipated Shut Down of Outlook: In case, MS Outlook dismisses abruptly, then Outlook OST might damage or develop inaccessible. As a result, to overcome such a problem, you require to close the MS Outlook after you are done your tasks.
  • Malware Attack or Virus: Malware or virus attack is the other reason to corrupt the MS OST file. Therefore, it is suggested to install a trusted and consistent anti-virus system in your device.

How to Solve Unable to Open OST File Error Within a Few Clicks?

There are several technical mistakes that lead to the damage of OST in MS Outlook. Therefore, users attempt to looking for the diverse approaches for their questions They are looking for a resolution for how to handle such sort of problems.

One of the best ways to deal with this issue is by taking the help of a third-party tool, i.e., Ignissta OST Converter tool, which can effortlessly let users export OST in Outlook PST file and seamlessly access their OST data file.

It is a trusted tool for users to import, as well as transfer OST into Microsoft Outlook. There are multiple benefits of using this utility, including it can help users to repair OST file, there is no need to perform multiple steps, and a lot more.

Do You Know the Location of OST?
To export OST into PST format, it is imperative to access the OST data file from the default system’s location and open it through the Microsoft Outlook. It can be easy to figure out your OST data file in the system by searching the following the file location:

C:\User\user name\AppData\Local\Microsoft\user name\username.ost

In case, a user attempts to access the Outlook OST data file in Microsoft Outlook, then the mail client app provides an error.

“The file C:\User\user name\AppData\Local\Microsoft\user name\username.ost is in use & can’t be opened.”

Manual Solutions to Fix OST File Cannot be Opened in Windows 10 Errors

In case, you are looking for a free or manual approach to fix this issue, it’s important to take the backup of the MS OST file. Then, you can pursue the below-mentioned steps:

Solution 1:

  • Right, hit on Taskbar >> Choose Task Manager.
  • Now, click on the Processes
  • Attempt to figure out searching like “Lync”, “Outlook”, “Communicator”, or “ucmapi”. In case, you discover any one of them, after that select it, and hit on “End Task”.

Soltion 2:

  • Close the Microsoft Outlook.
  • Now, open the Control Panel, Choose Mail, and then Email Accounts.
  • Choose an email address, which displays a username .ost error message and choose Change.
  • The, unmark “Use Cached Exchange Mode”.
  • After that, finally click on Next, as well as hit on Finish.
  • Finally, reinstall your Microsoft Outlook to mark the error is fixed effectively.

The Bottom Line

That’s all from my side! I believe that this write-up will assist throughout successful data migration. You can first try out some manual methods to solve OST file cannot be opened error; however, if they don’t bring any result, you require to opt for the third-party utility that is suggested by the technical professionals. The tool mentioned above provides several innovative functionalities to folks by which they can vigorously use their Outlook OST data again.

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