OST File Converter Tool

Microsoft MVPs Verfied Software to Convert Outlook OST Files

  • Convert OST File in Email Format: EML, EMLX, MSG, PST, NSF, MBOX
  • Export in Format: CSV, TXT, ICS, vCard, PDF, HTML, MHT, DOCX, RTF, DOC
  • Convert Large OST File without Exchange Profile & Server Connectivity
  • Export Corrupted, Damaged, Orphaned, and Inaccessible OST File
  • Export S/MIME & OpenPGP Encrypted from OST File Emails
  • Convert OST File Data: Emails, Contacts, Calendars, Task, Attachments
  • Export Exchange, IMAP, Office 365, & Hotmail OST Files Eamils
  • OST File Converter Tool is Compatible With All Microsoft Windows OS
* Outlook OST Converter Free Download is only for evaluation and provides conversion of limited data only

Why Choose SYSDaddy Microsoft OST Converter Wizard?

The majority of users own and use an MS Exchange Server account that syncs an Offline storage table file (.OST). It syncs, stores, and downloads all the email data items in an offline state whenever you log into your account. But there are times when emails become inaccessible. In these cases, users need a professional OST converter tool to export mailbox to other file formats. SYSDaddy OST file converter software is a multifunctional utility that offers mutliple formats to convert OST files. Resultant files would be in healthy formats regardless of the corruption level of OST files. Converted files can import and access to their respective application without facing any issues.

Key Features of OST File Converter Tool

Support Multiple File Format

Offers Export to Different Formats

OST file converter wizard is the perfect solution to accurately convert OST file to PST, EML, MSG, HTML, PDF, MBOX, vCard, CSV, ICS, TXT, HTML, DOCX, and other file formats. It can export all data items including emails, contacts, calendars, tasks, attachments, and many more. Users can access resultant files from various other supported applications such as Outlook, Thunderbird, Adobe Reader, and many other.

Quick and Advanced Scan

Quick and Advanced Scan Modes

Users get two scanning modes depending on the level of OST files errors in Outlook OST converter software. If OST files have minor issues, then choose Quick Scan mode. For severe errors in files, choose an Advanced Scan mode. It will scan the complete OST thoroughly and will help the user to convert OST data files without losing any data.

No Restriction

No Restriction Over Size / Type

There is no restriction if implied by the tool on OST files. No matter if the OST file is corrupted, large, orphaned, severely damaged, inaccessible, password-protected, or generated via IMAP, Exchange, or with Office 365 account. Professional Microsoft OST converter software is capable to convert OST files to user-specified file format without losing any sort of data.

Preview Items

Preview OST Items With Meta Properties

After scanning completion, the OST file converter tool displays an instant preview of OST data items. Users can preview OST files into Eight preview modes. One can analyze all the OST items including emails, tasks, contacts, calendars with their meta-properties. Along with this, users can easily identify permanently deleted data items in Red color.

Support Win & Outlook

Compatible with MS Outlook & Windows

OST converter software is a standalone utility that is compatible and supports OST files generated in all versions of MS Outlook versions that includes Outlook 2019, 2016, 2013, 2010, 2007, 2003, 2000. It is compatible with all advanced versions of Windows such as Windows 10, 8.1, 8, 7. So users don’t have to think about the Version of Outlook and Windows while installing the OST conversion tool.

Bulk OST Conversion

Convert OST Files in Bulk Mode

Outlook OST converter tool is idol software to accomplish the task of single and multiple OST files conversion in a single go. It offers various advanced options to add and customize the conversion process. Moreover, it quickly loads and displays the OST files data regardless the number of OST files that have been loaded. As this tool provides an OST file conversion report in CSV format, so users can analyze the process and can keep it for future use.

OST File Converter Tool - Specifications

Software Download

Size : 36.3 MB

Version : 8.0

Trial Limitations

The free OST File Converter tool trial version support exporting first 25 items from each folder. To avoid this limitation buy full version.

System Specifications

Hard Disk Space
500 MB of free hard disk space required

Minimum 4 GB RAM is required

Intel® Core™ 2 Duo CPU E4600 @ 2.40GHz


  • Microsoft .NET framework 4.5 or above must be installed.
  • If you are using Windows 10 / 8.1 / 8 / 7, then please launch the tool as "Run as Administrator".
  • Export in RTF Format:
    • MS Office should be installed on the user system on which the software is installed.

Supported Editions

  • Microsoft Windows – 2000, 2003, 2008 or Windows 10 / 8.1 / 8 / 7, 2008 / 2012 (32-bit & 64-bit)
  • Microsoft Outlook – 2003, 2007, 2010, 2013, 2016, 2019 (32-Bit & 64-Bit)

OST File Converter Tool - Working Steps
  • Step 1
    Run OST File Converter Tool

    Browse for the OST file

  • Step 2
    Choose Format

    Choose File Format to Convert OST files

  • Step 3
    Conversion Successfully

    Select destination to store data and click Export button.

OST Converter wizard
OST File Converter tool
Select Format
Convert OST File
What Clients Say about OST File Converter Tool

After uninstalling Microsoft Outlook, there were some OST files on my computer. These orphaned OST files need to be reformatted. No matter how many manual methods I've tried to convert OST files, none of them have been successful. Then one of my colleagues advised me to use SYSDaddy OST Converter wizard and it was a lifesaver. OST files can be converted without Outlook installation or data loss. I appreciate this support.

OST Converter Review

Michael Harrison

I had several OST files encrypted using S/MIME, and I needed to convert them to a different format for various reasons. After exploring the web for automatic methods that could convert an encrypted OST file, my search came up empty-handed. Then, I came across SYSDaddy Outlook OST Converter software one day while browsing some forums. After trying it, I was awestruck by its performance speed and precision. Five-star rating is well-deserved for this utility.

User OST File Converter tool

Brian Timothy

OST Converter wizard Review Review OST Conversion
Yes, you can convert any OST file that has been orphaned into various other file formats. for this, you don’t have to rebuild the server or install the supportive application.
Yes, Attachments connected with OST file emails can be exported using the Microsoft OST Converter software. It can export all types of attachments, such as.png,.jpg, mp3, and.docx, among others.
It is not necessary to have an active Exchange connection to convert OST file using the Outlook OST Converter Tool. So, you can easily export OST files even without having an active Exchange connection.
Yes, The OST File Converter wizard supports all Outlook versions including Outlook 2019 for conversion.
Yes, SYSDaddy OST Converter Wizard is a standalone utility that allows you to transfer offline OST files without installing Outlook and other applications on the system.

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