OST To PST Converter

Restore Corrupt OST & Convert Large OST to PST, EML, MBOX, MSG, EMLX, vCard, vCal, & Office 365/Exchange Server

KTools for OST To PST Converter

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OST to PST Converter is the best Conversion solution to recover OST data including Emails, Contacts, Calendars, Task, Notes, Journals & Other Folder and convert OST to PST, EML, MBOX, EMLX, HTML, MSG, & Office 365 and also export OST Calendar to vCal & Contacts to vCard even after OST file corrupted or MS Exchange Server in dismounting condition.

  • Convert OST Mailbox data including Emails, Contacts, Calendars, Task, Notes, Journals & Other Folder
  • Convert the recovered OST Mailbox data to PST, EML, MSG MBOX, EMLX, HTML file format
  • Export Exchange OST Contacts to vCard, & Calendar to vCal  
  • Split PST Options to splitting of heavy sized OST files into PST files by various file size  
  • Message Filtering Options to export OST emails between two specific date from Start & End Date   
  • Options to Export OST File to Office 365/Exchange Server directly   
  • Supports Compressible, Password-Protected & High level Encryption OST to PST Conversion
  • Support Conversion from Exchange Offline, Orphan, IMAP & Hotmail OST File
  • Restore permanently deleted [Shift+Del] mail data from healthy OST mailbox
  • Support Heavy OST files - No File-Size limitation
  • Repair corrupted/inaccessible OST file in every condition
  • Fix all types of OST error issues like Oversized issues, Sync Error etc
  • Multi-Language Support for the User Interface.
  • Supports all latest edition of MS Outlook: 2016, 2013, 2010, 2007 & below versions
  • Lifetime license validity & Convert OST to PST up to 30 emails per folder for Free

** FREE Download DEMO VERSION enables you to Convert initial recovered 30 emails Per Folder from OST file


Import/Migrate OST File in Outlook, Office365, Lotus Notes, Thunderbird & Live Exchange server Email Clients

Awards & Reviews

This utility is a reliable and practical single-function conversion application for exporting Exchange offline .ost file into .pst format on your Windows system. Read »


OST to PST Converter is a fast, smooth conversion and recovery program that you quickly scan of heavy OST file with minimize time. Save OST file in various file format such as PST, MBOX, EML, EMLx, etc. Read »

Common Problems & Solutions

OST Error

OST Error Issues

There are numerous users who encounter various error messages while accessing OST file of MS Exchange Server and MS Outlook such as: Improper Synchronization Error, Maximum Number of Applications Issues, Unable to Expand Folder Error, CRC Error, OST Oversized Issues etc. In this situation, you can simply fixes all OST errors by KTools OST Converter software.

Virus on System

Virus and Malicious Issues

OST file becoming inaccessible by Virus and Malicious application to damaging MS Outlook and Exchange Server files. You can use Best OST to PST Converter tool to solved out from this problem and easily to accssible OST file in Outlook PST file on local storage drive.

Hardware failures

Hardware/Software Failure Issues

Hardware failures issues such as local storage drive failure, bad sector failure, network connection failure makes your OST file inaccessible/corrupted. KTools OST to PST Converter utility is helping in recovering corrupted or inaccessible OST files in Outlook PST formats.

Shutdown Icon

Abnormally Terminating Outlook

Whenever MS Outlook program is shut down abnormally while opening, accessing or synchronizing the OST data, then OST file is prone to be inaccessible, corrupted or damaged. In this condition, you can easily recover your .ost file by KTools OST Exporter Software.

Key Features & Benefits

OST Scan

Scan to Recover OST File

Speedily and Safely repair Inaccessible and Corrupted MS Exchange/Outlook OST Mailbox such as Emails, Contacts, Calendar, Task, Notes, Journal and other folder database using OST to PST Converter utility as the software supports repair and recover OST file and convert it to PST format.

Virus on System

Keeps OST Database Original

Steps to follow while using OST to PST Recovery Program maintains the internal folder constitution of OST file as it is, while generating file. There will be no changes done in the internal hierarchy of files or folders.


Preview OST File

FREE Preview Data with OST Emails

This tool provides display converted OST files before saving them to the desired format. This facility lets you check the conversion quality and this is the best option to check the software functionality.

Email Properties

Maintains Meta Data

Faster OST to PST Converter tool has good advantages as it guarantee keep OST database with meta properties such as: (To, Cc, Bcc, Sent data and Attachments), received database Structure Original and maintain internal emails structure truly.


Export OST into Multiple Options

The most reliable OST Converter tool for quick and accurate conversion of OST file into multiple file formats like Outlook PST, EML, MBOX, EMLX, HTML or MSG format file format in few simple steps. also, export Exchange, IMAP, Outlook & Hotmail OST file to Outlook PST

Save Selected Messages or Items from OST

On saving selective messages or items from the recovered OST file; check or uncheck respective items and Click on Right Click to Export Option. Thus you would be able to save items from OST Mailbox such as emails, contacts & calendars file.


Export Selective Files / Folders

Select and check the specific file or folder that you want to export from OST to PSR, EML, MSG, MBOX, etc . Software will only export files & folders that are being marked with a check.

Supports MS Exchange/Outlook/Windows's Version

OST to PST Converter Tool support & compatibility to the latest version Outlook 2016, 2013, 2010, 2007, 2003 and also Windows OS 10 and below version.

What Clients Say

Dale Frazen, UK

Giving a try to your Exchange OST recovery solution before making actual buy was a wise choice. Truthful Exchange OST file repair and recovery results made your software extremely appraisable. Congrats for the nice work done.

Timothy D. Miner, USA

Last week a few significant mail folders were deleted by mistake and I was concerned regarding the deleted mail recovery, but KTools Technical Support helped me to recover the entire deleted mail folders completely. Extremely awed with working of support team and would like to say thanks to technical support of this software


What is the difference between DEMO version and FULL version?

DEMO VERSION allows users to limited functionality of the software. Some functions are disable in Demo version and allows user to convert limited data or items such as convert 30 mail items per folder. Demo version allows the users to evaluate the software before purchasing the Full VERSION.
FULL VERSION allows users to full functionality of the software. User can convert & save unlimited mail items in the software.
For example: Demo Version OST to PST Converter convert only 30 items of each folders and Full version of the software to convert all the items of all folders.

Can I repair corrupted/inaccessible OST file?
In which file formats can I save the converted OST file?
Can I recover permanently deleted emails from my OST file?