Microsoft OST to PST Converter

Repair corrupt OST and convert into PST, MBOX, EML, EMLX, MSG, HTML, vCard, vCal, Live Exchange Server, and Office 365 file types.

Quick Benefits & Features of OST to PST Converter:

(Average Rating 4.6 Based on 169 Reviews)

  • Complete Conversion of .OST mailbox contents Emails, Attachments, Calendar, Contacts, Notes, journals, and all mailbox elements.
  • Restore all properties: such as: To, BCC, CC, time, subject, images, date, & all attachments, etc.
  • Convert OST items into various file types such as PST, MBOX, EML, EMLX, MSG, HTML, vCard, & vCal.
  • Restore deleted/ permanently deleted OST emails items.
  • Free Preview lets access to each message before actual conversion.
  • Convert OST file and import into Office365 & a Live Exchange Server. New
  • Advanced option to export selected items only. New
  • Splits Converted OST files into Smaller Outlook PST Files(s). New
  • Repair & convert Office 365 NST file New
  • Support conversion of OST files into MBOX for Mozilla Thunderbird & Apple Mail.
  • Export OST contacts & Calendars into vCard and vCal file format respectively. New
  • Convert corrupted, password-protected, and highly encrypted OST files easily.
  • Advanced data Filtering Options to save data between Two Specific Dates. New
  • Supports MS Outlook 2019, 2016, 2013, 2010, 2007 & earlier versions.
  • No File Size Limitation and recently successfully converted a 215 GB file. New

*Demo Version Recovers/ Preview complete OST items and allows to save only 30 items from each folder.

PDF Installation     PDF Uninstallation    PDF End User License Agreement

Reviewed by

Experts Exchange

"KDETOOLS, a well known name now! It has gained lots of fame in just the span of few years in the online market world. Company created many trusted and superiorly working tools in the field of Data Recovery, Email Migration, Cloud Computing, etc."

Trust Pilot

"After reading all the mix reviews about the kdetools software company, I was in doubt but I took a risk (because I wanted to migrate my .ost file data directly into live Exchange server mailbox). But after purchasing & using its software, I want to say that company's service is above the expectations."


Prominent Features of OST to PST Converter

Convert OST File to Various File Types

The OST to PST converter tool allows users to convert OST file(s) to various file types such as Outlook PST, MBOX, EML, EMLX, MSG, vCard (for Contacts), vCal (for Calendar), HTML, Office 365, and Live Exchange Server.

*Message filtering option (as per Date) is available for all file formats.

OST File Saving Options

Import OST to Office 365 / Exchange Server

This tool facilitates you to import OST files to Office 365 and Exchange Server directly. You can also use the Message Filtering option to move desired emails as per given specific date range.

*Software is embedded with highly secured techniques that provide complete data security.

OST to Mail Servers Options

Supports Converting Complete OST Items

The software easily supports to convert complete OST items such as Mails, Contacts, Calendar, To-do list, Journals, Notes, Tasks, Folders, Sub-Folders, etc. without losing any single bit of data.

*During file conversion it maintains Files and Folder structure in their hierarchical order. Properties of all items will be restored in its original form.

Convert Complete OST Items

3 in 1 - Support to Convert OST | PST | NST Files

This is the single tool which provides multiple functionalities so that users can easily complete all their requirements in a single place.

*The tool easily convert PST, OST, and NST files to the desired file format along with that you can also move these files to Mail Servers like Office 365 and Exchange Server.

3 in 1 Conversion

Split Resultant PST File into Smaller Parts

Split resultant PST files into smaller parts:

  • By Size (split up to 1 GB to 25 GB)
  • By Folder (Export selected folders only)
  • By Date (Message filtering option to export items from a specific date range)

*You can also combine all these options for better file management like you can split the file as per Size from a given data range.

Split OST by Date, Size, and Folder

Recovers & Convert Inaccessible OST Files

(Supports to convert Orphan, IMAP, and Exchange Server Offline Storage files.)

This application provides advanced scanning and OST recovery options by which helps users to recover items from Corrupted/Damaged, Highly-encrypted, and password protected OST files.

*Software automatically detects and fixes OST corruption issues.

OST File Scanning Process

Export OST Contacts/Calendar Individually New

Software exports OST Contacts and Calendar to vCard and vCal file types respectively. This option will help you to move Contacts and Calendar to any supported platform.

*It converts/exports all details such as Fields, Additional fields, Contacts Images, Properties, etc.

Export OST Contacts and Calendar

Maintains Email Properties / Folder Structure

The software keeps all email Meta properties such as To, Cc, BCC, Sent/Receive date & time, attachments, etc. as it is as before while converting OST file to any file format. Along with that, it also maintains original files and folder structure.

*There will be no changes done in the internal hierarchy of emails or folders and Meta properties.

Email Properties

Free Preview of OST Email Items

The OST to PST converter by KDETools allow users to have a full display "Preview" of recovered OST email items including all Folders, Sub-folders, Email messages, Address Book, Contacts, Attachments, Embedded Images, HTML Formatting, Deleted folder, etc.

*Preview facility is available in the free demo version that enables you to preview complete OST items.

OST File Preview

Compatibility with All Latest Editions

Microsoft Outlook: Supports all versions
Outlook 2016 // Outlook 2013 // Outlook 2010 // Outlook 2007 // Outlook 2003
Microsoft Exchange Server: Supports all versions 2016/ 2013/ 2010/ 2007/ 2003 (SP1, SP2, and SP3)
Microsoft Windows: Windows 10, 8.1, 8, 7, Vista, XP.

*Software supports all OST files, whether it Orphaned, IMAP, or Exchange Server file.

Try KDETools OST to PST Converter for 100% Safe Conversion

PDF Installation     PDF Uninstallation    PDF End User License Agreement

*Free download enables you to check OST file contents and save initial 30 messages.

System Specifications

Support : Windows 10, 8.1, 8, 7 & all below Windows version
Processor : Intel® Pentium 1 GHz processor(x86,x64) or equivalent
RAM : 2GB of RAM is recommended
Hard Disk Space : Minimum 100 MB for installation is required

Note: If you need to customize OST to PST Converter or need additional features then, Contact Support staff

Supported Editions

Microsoft Windows
2000, 2003, 2008, XP, Vista, or Windows 7/8/8.1/10, 2008/2012 (32-bit & 64-bit)
MS Outlook
Outlook 2000, 2003, 2007, 2010(32/64 bit), 2013 (32/64 bit), 2016 (32/64 bit), 2019
Support recovery of OST file of 32-bit & 64-bit New

Software FAQs

Use steps for quick OST to PST conversion:

  1. Download, Install, and Run KDETools OST to PST Converter.
  2. Select OST files that you want to convert.
  3. Check full the preview of OST file contents.
  4. Click on the "Export" button and choose PST from saving options.
    *You can also choose other options as per need like MBOX, EMLX, vCard (for Contacts), vCal (for Calendars), etc.
  5. Click on "Browse" button to save destination path.
  6. For splitting PST file, choose the desired option:
    "Split PST" to divide a file by Size
    "Message Filtering" to divide file by Date
  7. Click on the "Convert Now" button to start conversion process.

Note: Converted PST files can be easily imported in any version of Microsoft Outlook.

The OST (Offline storage table) file is the local copy of a user mailbox stored on the Exchange server. By default, you can find the .ost file on the following locations:

drive:\Documents and Settings\\Local Settings\Application Data\Microsoft\Outlook

Yes, the tool converts complete OST items into PST for Outlook such as Emails, Contacts, Calendar, Attachments, Tasks, Notes, Email Metadata, etc.

No, Software does not make any changes in original files/folders structure and email's properties. It provides exact data as it is as before the conversion.

The software supports converting OST files into multiple file formats such as PST, MBOX, MSG, EML, EMLX, HTML, vCard, and vCal. This tool also moves OST file to Mail Servers like Office 365 and Exchange Server.
Yes, the tool easily converts heavy sized OST file. It is also helpful to split the resultant file into smaller parts.
Yes, we provide a FREE demo version by which you can easily check the preview of OST file contents including Emails, Contacts, and Calendar.
You are not required to have Exchange server services when it is to convert OST to PST.
There is hardly any requirement for the original Outlook profile when it recovers the OST files into Outlook PST.
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