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This Blog GEEKS ACADEMY is a Web Magazine for Geeks and Bloggers. Here all about to Social Media, How to Blog Tips, Web Apps, Software Solutions.

OST is not a Personal Folder File is a common error that many Outlook users face. If you are looking for a reliable and quick solution to this problem then you are at the right place. In this post, we will let you know how to resolve this error in a trouble-free manner. Besides the solution, readers will also know to elaborately about how to recover corrupted ost file in Outlook.  

An Introduction to MS Outlook
MS Outlook is one of the most popular email clients in the world. Outlook is basically a desktop-based email client, but users can connect it to Exchange Server or use it as a part of Office 365 Suite. Once Outlook is configured with Exchange Server, OST file gets created. Even if the user works in the offline mode of Outlook (when it is not connected to Exchange Server,) the data gets stored in OST file. Later, the data gets synchronized with Exchange Server. Though there are many benefits of Outlook OST files, users sometimes get errors related to OST files. The error we have chosen for this post is "Outlook.ost is not a Personal Folders File." Until the error gets fixed, users keep getting this error message. As a result, it becomes impossible for the user to continue using Outlook.

Reason Behind OST is Not a Personal Folder File Error

To solve the error, the knowledge about the cause is mandatory. Often, Outlook fails to recognize OST file or synchronize it with the Server, and that is the time when this error occurs. We have compiled some of the major reasons for Outlook.ost is not a Personal Folders File error.
  • Damaged or corrupt Outlook OST file
  • OST file not being synchronized properly with Exchange
  • Outlook getting closed suddenly because of power cut
  • OST file getting infected by malware or virus
How to Resolve OST is not a Personal Folder File Error

If we go through the reasons, it will be seen that the damaged OST file is one of the biggest reasons for the occurrence of this error. In most cases, the error gets resolved if the OST file corruption is fixed. Here we will learn how to fix OST file corruption in order to terminate "OST is not an Outlook data file" issue. Both manual method and a reliable method will be described here.

Location of OST File

Before fixing the corruption issues of Outlook OST file, let's learn the default location of OST file in a Windows system. Going to this directory, you can find the OST file:

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

Manual Method to Resolve Various OST Issue
Here is the manual method that can be used to fix Outlook data file error. As all manual methods contain a high risk of data loss, users should backup OST to PST file data before performing this manual technique.
  1. Navigate to Control Panel of your system and then double-click on Mail.
  2. A dialog box will open. Click on Show Profiles option and choose the Outlook profile you use.
  3. Now select Properties option and click on Email >> Exchange.
  4. Click on Change option and select the checkbox corresponding to Use Cached Exchange Mode.
  5. Now click on More Settings>> Advanced and then click on Offline Folder File.
  6. You have to go to Settings again and click on Disable Offline>> Yes.
  7. Now, open the settings of Offline Folder File>> click OK.
  8. Click Next>> Yes.
  9. Navigate to "Cached Exchange Mode" Settings to select Use Cached Exchange Mode option. Click OK.
  10. At last, click Next>> Finish>> Close.
Shortcomings of Manual Method
The manual method we have just mentioned is not the best way to fix ".ost is not an Outlook data file." It is a lengthy process and it is difficult to perform this technique flawlessly. Moreover, this method is not completely reliable to fix OST corruption. Due to these shortcomings, most people use OST to PST Converter.

Reliable Method to Resolve OST File Corruption
However, there is a reliable way to fix damaged OST files. There are different applications available that can resolve corruption from OST files. OST to Outlook PST Converter is an application that is highly recommended by the experts to fix "OST corruption issue" issue. The software is capable of removing OST file corruption, even the major ones. Once the OST file gets fixed, it will not show ".ost is not an Outlook data file" error anymore. This program can be used in all latest versions of Microsoft Outlook including Outlook 2016.


"OST is not a Personal Folders File" is a critical issue for the Outlook users that can cause severe trouble for them. To solve the issue, we have shared two different techniques to fix Outlook OST file corruption. Users may try any one method, but it is wise to choose the mentioned tool because of its efficiency. It will fix all types of Outlook OST file corruption and ultimately make your Outlook free of "OST is not a Personal Folders File" error.
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In this post, we will look upon a conversion software named NSF to PST Converter. This program has been quite useful to export all IBM Notes files in PST format.

Our organization can be termed as large sized due to its employee count and business expansion. We have been a loyal subscriber of IBM Notes for a long time, which was previously known as Lotus Notes. Unfortunately, Lotus Notes could not keep in pace with the time. For this reason, we have deiced to switch to another office suite that has all contemporary features. Once we had chosen to migrate from Lotus Notes to Office 365, the biggest challenge for us was to export NSF to PST format.

After the decision of migration had become final, we started to look for converter applications that can smoothly migrate all our NSF files to PST. We have all our valuable files and data in IBM Notes, that we needed to be transferred in Office 365. We were not in a position to lose any data at all during migration. After trying several conversion software, we came across NSF to PST Converter Software. This application was capable of moving all NSF files to PST format. Being highly impressed by this tool's features, we have decided to write this product review so that others can know about the superb functionality of this Converter.

SysTools NSF to PST Converter: An Overview

NSF to PST Converter is a utility that helps user to convert their data from NSF to PST format. Complete NSF files can be exported in PST format through this tool. After migration, it keeps both internet header and HTML formatting of the files. During our usage, we have noticed that it contains to advertisement or malware. Users can utilize this program without the worry of getting infected by virus or malware. Its user interface is easy to understand. That is why, both technical and non-technical users will not face any problem operating this application.

Central Features of NSF to PST Converter Application

Here are some prominent features of this tool that grabbed our attention:
  • Converts all NSF Items to PST: All NSF file items can be converted in PST file with the help of this application. The complete NSF file includes Lotus Notes email, calendar, contacts (also known as names.nsf file,) tasks, notes, journals, etc.
  • Moves Email Attachments: When we say complete migration, we mean all elements including email attachments. IBM Notes emails can contain all sorts of attachments and this tool is capable of migrating them all. Images, audio/video files, documents - all types of attachments can be migrated using this program.
  • Eliminates Duplicate Contacts during Migration: It is quite possible that your IBM Notes data contains the same contact more than one time. During data export through this tool, users can enable this option of removing duplicate contacts. This feature makes sure that one contact exists only once in your Office 365 PST file.
  • Retains Original Folder Structure: Many users complain that after data export, folder structure has been changed. There will not be a scope of complaining if you use this software. It maintains the original folder structure in the destination file also.
  • Option to Selective Migration: The program values your time and effort. That is why it has selective export option. It allows you to migrate only the files or folders necessary for you. From now on, you will not need to migrate all files unnecessarily.
  • "Remove Encryption" Feature: Encrypted NSF files are not possible to export. To enable transferring encrypted NSF emails and other files, this application has the feature named Remove Encryption. With its help, the encryption is removed first and then the file is moved to PST.

This amazing tool has a lot of pros that are listed here.

1. Export Lotus Notes to Outlook as well as exports them to Office 365 & Live Exchange Server
2. Bulk NSF file export feature available
3. Ability to remove IBM Notes file encryption
4. Compatible with Outlook 2016 and all other versions

There are no cons of this software worth mentioning. The only drawback that can be pointed out is that this application is a Windows-based tool. It will not function on Mac OS.

Final Verdict

The requirement of our enterprise was wide ranging as well as sensitive. With so many similar applications available in the market, it was not an easy task to choose one tool. We had tried other programs beforehand but no other tool was able to fulfill our requirements. After using the demo version of this converter, we have decided to put the responsibility of NSF to PST conversion on this utility. NSF to PST software is an expert in exporting IBM Notes files to PST in a true sense. We are happy to rate it with 9.8 out of 10 for its brilliant performance in converting NSF files in PST format.

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Robert Perry: “I have updated from Office 2013 to 2016. I have a corrupt Outlook data file and I cannot open it. I tried to find a way to scan this corrupted file, but scanpst.exe is missing from my computer. Where can I get it from? Is there any way to repair Outlook OST file? Any help or suggestion would be greatly appreciated.”

Are you also seeking an answer to the same query? Are you also stuck in the same problem? Well, do not lose hope as the problem can be easily fixed with the help of solutions explained in the post. So, let us get started.

MS Outlook equips the user with an inbuilt utility to resolve the corruption in Outlook OST file. This free tool is known as scanpst.exe or inbox repair tool. There are many reasons for corruption in OST file like over-sized OST file, virus attack, sudden shutdown of system, etc. While repairing the Outlook data file, sometimes, an error message stating “scanpst.exe is missing from my computer” appears on the screen. This error is mostly encountered due to incompatibility issues of OST file with the Outlook version.

The post explains the feasible solutions to repair OST file in Outlook 2016, 2013, 2010 and other below versions.

Location of Scanpst.exe in Different Outlook Versions;

Microsoft Outlook 2013: C:\Program Files\Microsoft Office\Office15
Microsoft Outlook 2010: C:\Program Files\Microsoft Office\Office14
Microsoft Outlook 2007: C:\Program Files\Microsoft Office\Office12
Microsoft Outlook 2003: C:\Program Files\Common Files\System\MSMAPI\

Symptoms of Error in Scanpst.exe Outlook 2016

When the inbuilt repair tool is missing from the system, the Outlook data files become inaccessible and Outlook will freeze for some time. The most important factor responsible for this error is the incompatibility issue of scanpst.exe with the edition of Outlook installed in the system. The secondary reasons behind this error are:
  • Large-sized OST file
  • Virus or Malware Attack
  • Hardware Problems
How to fix the Error “Scanpst.exe is Missing From My Computer”?

Some of the measures which help a user to remove the error and fix OST file 2010 to bring it back to a healthy state are:
  • The first and foremost thing to do is reduce the size of OST file.
  • Eliminate virus infection by executing a strong antivirus application.
  • Take care of the fact that inbuilt repair tool is adaptive with the version of MS Outlook installed in the local machine.
  • Remove the corrupted attachments from Microsoft Outlook emails.
There is a possibility that after doing these steps, scanpst.exe for Microsoft Outlook 2007 will run without any problem. But, if the manual approaches do not fix these issues and a user can opt for an automated solution.

Professional Solution to Fix Corruption Issues of OST File

To restore the data of corrupted OST file and turn it into a healthy state, users can use a third-party utility like OST repair tool. According to the experts, it is a perfect solution to repair the error code “scanpst.exe is missing from my computer”. Some of the unique features of this application are:
  • The tool enables the user to recover hard deleted Outlook emails
  • Repair Outlook data files with both, major as well as minor corruption.
  • Multiple Outlook files can be repaired in batch
  • This well known Microsoft OST to PST Converter does not impose any file size limit
  • Outlook data file restored can be converted to different file formats
  • Password protected corrupted Outlook file can be fixed using this application
  • The emails along with other data items like contacts, calendars, etc., can be extracted
  • Selected data can be extracted by applying filters
  • Outlook environment is not necessary for working of this utility
  • The tool is compatible with Windows 10, 8.1, 8, 7 and other below versions
The Bottom Line
Scanpst.exe is an inbuilt utility to repair Outlook data files and make them accessible to users. Whenever an OST file is corrupted due to any reason, it is repaired with the inbox repair tool. But, many times users encounter the error statement, “scanpst.exe is missing from my computer”. The post deals with the methods to resolve this error. If the manual technique doesn’t work, an automated tool is also explained.
This Blog GEEKS ACADEMY is a Web Magazine for Geeks and Bloggers. Here all about to Social Media, How to Blog Tips, Web Apps, Software Solutions.
Microsoft Outlook and Office 365 both are developed by Microsoft and very much popular among both business as well as individual users. However, when a user works on on-premise Exchange Server, an OST file is created by Outlook that let users work in an offline mode. But there are multiple reasons due to which a user needs to move OST file to Office 365 account. Among all such reasons major one is that Office 365 let users access all MS Office Suite applications in an online mode i.e., anywhere and anytime. In addition to this, the data stored in the Microsoft cloud reduce the chances of corruption also. Regardless of all such reasons, there are many other benefits and services offered by Office 365 to its users. Considering all these major points, it is pretty much clear that users want to know how to move OST file to Office 365 account.

What is OST File Format?

An OST file or Offline Storage Table is a data file created by Microsoft Outlook. It is basically a replica or copy of the Exchange Server mailbox maintained on the local machine. OST file mainly comes in use whenever there is no connection with Exchange Server mailbox. It saves all emails, journal, tasks, notes, etc., in a single file. As the connection is established again, this OST file gets synchronized with Exchange Server automatically and update all changes done in an offline mode.

What is Office 365 Application? 

Office 365 is basically a cloud-based platform provided by Microsoft containing a number of software and services. It can be referred as a web-based version of MS Office Suite including some additional applications. A user can access all MS Office application with some particular amount of storage space to keep data in the cloud. Apart from all this, it includes SharePoint Online for collaboration, Exchange Online for emails, Lync for the unified communications, etc., to manage work in a synchronised manner. Need to Export OST to Office 365 Account As discussed above Microsoft Office 365 is a web-based email application popular among the users. This application allows users to access mailbox data items from anywhere and at any time. No need to purchase any extra infrastructure service to work and access this email platform. Users just need to pay for the services they are using and are also allowed to cancel any service at any time without any restriction. All other benefits of using Office 365 account are discussed below:
  • Web-based Application: As it is clear that MS Office 365 is a cloud-based application. It let users access all Office applications without installing them over the cloud and access to them from anywhere using any device.
  • Offers High-level of Security: Microsoft Office 365 has a high level of security, which means that all data stored over Microsoft cloud is safe and secure. Hence, there will be no security issues while using this email application.
  • Update Software Automatically: The best about Microsoft cloud is that it automatically manages the storage, up-gradation, installation, and maintenance of application. A user need not to update these applications manually.
  • Large Storage Capacity for Emails: It offers total 50GB of storage for each mailbox to keep all data items of Exchange such as emails, calendars, tasks, and journals files.
  • Prevent File Synchronizing Problems: In Microsoft Office 365, a user needs to synchronize the replica of mailboxes with Exchange server. It is because Microsoft Office 365 service manages all synchronize and update automatically.
How to Move OST File to Office 365 Account?

1. Open OST to PST Conversion software on your local machine and click on Add File button to upload either healthy or damaged OST file. After that, Browse the OST file that you want to export to Office 365 and click on Open >> Add File button.

2. As the scanning process completed successfully, the software will provide the preview of all data items stored in the OST file. You can preview all mailbox items like contacts, calendars, tasks, journals, notes, emails by clicking on the respective tab given in the left pane.  
3. After that, click on the Export button from the menu bar and choose Office 365 option as a Export Type. Now, click on the Advance Settings button to customize the Ost to Office 365 export process.


4. Now, if you want to use Impersonation feature, click on Office 365 settings and enter Admin account username and password. This option will let users import single OST file to multiple Office 365 user accounts.

5. After that, click on the General Settings tab. Here, you can see Date-based filter and Categories selection filter. Using these two options one can migrate selective data from OST file to Office 365 account. When you are done with your selection, click on the Save button.

6. Next, there are two ways of exporting OST to Office 365 account i.e., Enter Destination mailbox directly and Provide destination Office 365 accounts from CSV. Using this two option either you can enter username and password for each mailbox one by one or directly upload a CSV by clicking on Browse button containing all destination mailboxes with their usernames and passwords.

7. After that, click on Next button and export process begin. It will generate an Export Report containing all details of migration process. You can save it in CSV format also for future reference.   

Observational Verdict

Cloud-based applications offer more services to its users compared to the desktop-based application. Therefore, users are moving towards the web-based application. But in some cases, they need to access their old data also. Thus, to do such type of tasks in an efficient manner, one can use OST Recovery tool. This application let users move OST file to Office 365 account in a seamless manner. Considering all functionality and working of this tool in mind, this software can be rated as 9.8 out of 10.