How to Recover Deleted Emails from Encrypted OST Files?

Microsoft Outlook application’s database files stores all the informational data in the hierarchal structure as the backups. As it is the fact that PST files stores complete Outlook data including emails, contacts, calendars, tasks, notes, journals etc. and is located at the system drive location. And the OST files can be used in offline mode by users by enabling the cache mode. Any changes in mailboxes performed in offline mode can be updated as soon as the connection is established with the Exchange Server. So, there is involvement of crucial data from Outlook as well as Exchange and it arises the need for security of these databases.

Talking about the Outlook files, both OST and PST files can be encrypted as per the user’s choice. Using account settings feature in Outlook, database files can be encrypted and prevented from any sort of misuse by the foreign elements or users. So, any user who wants to access data from these files would needs to provide the respective passwords (if setup) before it.

Can encrypted OST/PST files Data Gets Corrupted?

It surprisingly looks odd, but it is true that even encrypted Outlook database files can get corrupted. Both OSTs and PSTs are prone to corruption errors which lead to the inaccessibility of data ultimately. Not only inaccessibility through corruption, users may face deletion of OST and PST files emails owing to the following reasons:

  • Virus attack on the computer system applications like Outlook.
  • Conflicts with other installed software applications.
  • Malfunctioning of Outlook related settings
  • Interrupted or fluctuating power supply
  • Network Connection error
  • Physical damage, hard drive formatting
  • Exchange Server file system corruption
  • Failure in booting of email client or Exchange Server
  • Mal-configuration of Exchange Server
  • Unexpected power shut down

The encrypted OST/PST files data could be deleted or missing due to corruption issues also. In such condition, you can take help from the inbuilt repair utility scanPST.exe for repairing PST files and scanOST.exe application for repairing OST files. Users can recover the deleted data as well from these corrupted database files.

If the emails are deleted temporarily, then it is available in the Deleted Items folder of the OST file mailbox and be moved or restored from there to other folder. But if the Deleted Items folder is also empty or emails are deleted from there, then there is a need to practice other solutions to recover deleted emails from encrypted OST file.

Ways to recover deleted emails from encrypted OST files

Microsoft In-built Utilities


It is also known as Integrity Check Tool. This application is available up to Microsoft Outlook 2010 version only. The exe application can be located at the following locations as per different Outlook versions.

C:\Program Files\Microsoft Office\Office14\ – Outlook 2010
C:\Program Files\Microsoft Office\Office12\ – Outlook 2007
C:\Program Files\Common Files\System\MSMAPI\ – Outlook 2003
C:\Program Files\Common Files\System\MAPI\ – Outlook 2002/XP
C: Program Files\Common Files\System\MAPINT\– Outlook 2000

Once reached the exe folder location, user can open it by double-clicking on it. Then Browse the profile for corrupt OST file and select the folders for scanning. Check the Repair Errors option and click on Begin Scan option to start scanning. Once the scanning is successfully completed, users can check for the error information and the possible fixing.

The limitations with this utility are that it is not available for the latest Outlook versions and also fails when the corruption is severe. Recovering lost or deleted items is also not so possible.


It is a free utility provided by Microsoft to repair both OST and PST files. Users can find it available for all Outlook versions. The basic location for this utility is

  • C:\Users\<username>\AppData\Local\Microsoft\Outlook – Outlook 2010/Outlook 2013/Outlook 2016/Outlook 2019 and Office 365
  • C:\Users\<username>\Documents\Outlook Files\ – Outlook 2007 and earlier versions

The Inbox Repair tool can be accessed from the above location and encrypted PST/OST file can be added for scan. After the scan, users can take a backup of their PST file with the provided option and then start the Repair of the file. After sometime, the repair will gets completed with a message.

The repair can also be a failure if the file size is large than 2 GB or the corruption is of high-level. Also, PST errors can cause loss of more data also while performing the repair.

Using Outlook Mail Settings

Perform the following procedure to recover permanently deleted emails from your OST file manually.

  1. From the Control Panel on your system, click on Mail option.
  2. Click on Email Accounts option.
  3. Select the OST email account and click on Change option.
  4. Next, click on the More Settings option.
  5. Switch to the Advanced tab and uncheck the ‘Use Cached Exchange Mode’ option. Then click on Apply button under the Microsoft Exchange window.
  6. Click on Outlook Data File Settings option.
  7. Now, select the Disable Offline Use option and click OK.
  8. A message saying ‘Outlook will not be able to work with your OST file’ will appear. Click Yes to continue. This will redirect you to the More Settings window.
  9. Select Outlook Data File Settings option again. Use Browse option to open old offline data file and click OK.
  10. In the Change Account window, select the checkbox Use Cached Exchange Mode, click on Next and finally, click on Finish.
  11. Open the Outlook application. A message ‘Outlook is using an old copy of your OST’. Will appear. Click OK to continue.
  12. Now, deleted emails are recovered from .ost file.

Again, this method also is not suitable for large-sized .ost files and which are corrupted severely.

So, as we have understood that the inbuilt utilities are not fully dependable to retrieve deleted items from the encrypted Outlook OST and PST files, and Outlook settings method is not always successful; we seek a complete and efficient solution here.

The advanced Outlook Repair Kit is the prominent solution to deal with all issues of OST as well as PST files like recovering deleted items from encrypted Outlook OST and PST files. It is a secured, easy way to recover data from any size, encrypted, corrupted or any version Outlook files. The repair and recovery is efficient and without any flaws from any end. You can select you data for recover with the use of smart and advanced filter options. So, get it as soon as possible from its website. To clear any doubts, you can try the demo version for free and then make a decision as per the experience. Keep reading.


The encrypted OST and PST files are also prone to corruptions as well as deletion of data at some point of time. Though Microsoft has provided free repair utilities but it too fails at severe situations. A trusted, professional OST Repair tool is the ultimate recommendation for users to get out of this situation and get the deleted OST emails back.

Download Now