Since an OST file can’t be imported into Exchange server, Outlook, or Office 365 accounts, you need to convert the OST file to Outlook importable PST format. Microsoft does not provide any software or tool to convert an Outlook OST file to PST format, besides an option to export mailbox data to a PST via Outlook Import/Export wizard. However, this option works only when you have access to your Outlook profile.
This is where an OST to PST converter software is often required. An OST to PST converter software, such as Stellar Converter for OST can help you access the mail items from an inaccessible or orphaned OST file when Outlook can’t be accessed, displays OST file error, or Outlook profile is either deleted/disabled from the server. It converts the Outlook Storage Table (OST) file that contains mailbox items, such as emails, attachments, calendars, notes, journals, etc. to Personal Storage File (PST) format.
It also helps you migrate the Exchange or IMAP Outlook OST mailbox to a different Outlook profile, Exchange, Office 365, Apple Mail, Thunderbird, or other email clients. Similarly, there are a few other reliable OST to PST converter software for Windows. We’ve discussed these 10 best OST to PST converter software of 2024 based on their features and performance to help you choose the best for your OST to PST conversion needs.
List of 10 Best OST to PST Software
Below we have discussed the 10 best OST to PST converter software.
1. Stellar Converter for OST
Stellar Converter for OST is the best and most highly rated OST to PST converter software. It is trusted and recommended by Microsoft MVPs and IT admins to convert orphaned and inaccessible OST files to PST and other formats. It helps you extract the mailbox items from Outlook OST with 100% precision and integrity. It also recovers deleted and lost mailbox items such as emails, attachments, contacts, calendar items, etc.
The software converts multiple OST files to PST without any file size limit. It helps users migrate their mailbox items to different platforms or email profiles, such as Outlook, Office 365, or live Exchange profiles.
Features
- Converts inaccessible, encrypted, and orphaned OST to PST file format
- Extracts all OST mailbox components, such as emails, attachments, contacts, calendar entries, notes, journals, etc.
- Converts OST file of any size
- Faster OST to PST conversion
- Recovers deleted mailbox items and highlights them with red color
- Batch conversion option to convert multiple OST files to PST files at once
- Advanced filters to recover selective emails or messages from OST file based on ‘To’, ‘From’, ‘Subject’ and ‘Date’ filters
- Provides preview of mailbox items in a three-tier structure after conversion
- Multiple saving options, such as PST, EML, MSG, PDF, RTF, and HTML
- Exports OST file to Office 365 account or live Exchange server directly (Technician version)
- Option to export Contacts as CSV in just one-click (Technician version)
- Option to split the converted OST file while saving it as PST
- Option to Compact converted PST file to save storage space
- 24*5 dedicated technical support via call, email and chat
- Supports Outlook 2003, 2007, 2010, 2013, 2016, and 2019
- Compatible with Windows 7, 8, 8.1, and 10
Cons
- Demo (free) version saves only 20 items per mail folder to PST. But, you can preview all mailbox items in OST file for free after conversion.
2. Advik OST to PST Converter
Advik OST to PST Converter is an advanced software that quickly converts OST file to PST format. Besides PST, it also saves the OST file to MSG, MBOX, PDF, EML, TGZ, DOC, and several other file formats.
Features
- Converts OST file into PST without any file size limit
- Supports OST file created by Outlook 2019, 2016, 2013, and earlier versions
- Maintains the OST mailbox folder hierarchy and metadata
- Multiple output file format support
- Repairs damaged OST file
- Exports to Office 365
- Batch Conversion option to convert multiple OST files to PST
- Converts encrypted OST file
- Compatible with Windows 10, 8.1, 8, 7, and older versions
Cons
- Compact PST option is not available
- No option to export OST to live Exchange or existing Outlook profile
3. SysTools OST to PST Converter
SysTools OST to PST converter is another popular OST converter software that converts Outlook 2019, 2016, 2013, 2010, and below version OST files to PST format. The software can convert single or multiple OST files to PST. It also supports encrypted and orphaned OST file conversion. You can use the software to convert, export, and backup OST mailbox data to either PST or other formats, such as HTML, EML, MSG, and Office 365.
Features
- Converts Outlook OST files to PST, EML, MSG, HTML, & PDF formats
- Converts inaccessible or orphaned OST files to PST
- Supports conversion of large OST files
- Supports Batch Conversion to convert multiple OSTs to PSTs
- Decrypts encrypted Outlook OST emails and removes S/MIME & OpenPGP encryption
- Supports Outlook 2003, 2007, 2010, 2013, 2016, and 2019
- Compatible with Windows 10, 8.1, 8, 7, and below versions
Cons
- Requires .NET framework 4.5 to avoid compatibility issues.
- No option to compact PST file
4. SystInfoTools OST to PST Converter
SysInfoTools OST to PST converter is one of the best tools to quickly convert OST files to PST and other file formats, such as DBX, MBOX, EML, MSG, and Archive formats. The software also repairs damaged or corrupted Exchange or IMAP Outlook OST files. You may also convert and export password-protected OST files to the PST file.
Features
- Converts OST to PST, DBX, MBOX, MSG, EML, and Archive formats
- Exports OST mailbox items such as emails, journals, task, to-do, etc. to PST format
- Converts damaged or corrupt OST files
- Previews mailbox items before saving
- Supports password-protected or encrypted OST files
- Supports OST file of any size
- Provides status report of OST to PST conversion
- Converts OST to PST with precision and accuracy
- Option to exclude email by using various filters
- Supports Bulk OST file conversion
Cons
- No support for Office 365 and live Exchange
- Limited output file format options
- No option to compact PST file
5. Offline OST to PST Converter
Offline OST to PST Converter is also a reliable OST to PST converter software which is available for Windows. The software converts Outlook OST to PST, MSG, EML, VCF, and TXT formats. It recovers emails, tasks, journals, items, notes, contacts, events, calendars, etc. from OST and saves them to Outlook importable PST format.
Features
- Converts OST to PST locally without internet access
- Supports orphaned, inaccessible and password-protected OST files
- Converts OST files of any size
- Extracts and previews OST mailbox items
- Converts OST files in ANSI (Outlook 97…2003) and UNICODE (Outlook 2007 and later) formats
- Extracts data from damaged OST files
Cons
- No option to split or compact PST files
- Slower scan
- No support for Office 365 and live Exchange
- Batch conversion is not available
6. Aryson OST to PST Converter
If you are looking for a reliable OST to PST file converter tool, you can download the Aryson OST to PST Converter. The software quickly converts OST to Outlook PST. It also exports OST emails to Windows Live Mail (EML) and Thunderbird mail (MBOX). You can use this software to export OST mailbox items such as emails, attachments, contacts, calendars, tasks, notes, etc. from an offline OST file to Outlook importable PST format. It can also handle severely corrupt OST files. The software maintains data accuracy and integrity during conversion.
Features
- Easily converts OST file to PST, EML, MSG, MBOX, DBX, and Archive formats
- Intuitive and user-friendly interface
- Allows users to find and locate Offline OST files
- Previews migrated OST files after conversion and before saving
- Compatible with all MS Outlook versions and Window OS
Cons
- Demo version converts OST to EML format only
- No option to export OST files to Office 365
- Does not recover deleted items
- Does not support Office 365 and live Exchange
7. BitRecover OST to PST Converter
BitRecover OST to PST Converter is another OST to PST converter software. BitRecover converts inaccessible or orphaned OST file to PST while maintaining the data integrity and accuracy during the conversion. It features advanced algorithms that convert OST files into various file formats. The software also ensures no data loss during the conversion process.
Features
- Converts OST to PST without size limit
- Saves attachments to PST file after OST conversion
- Exports OST file directly to Office 365, Outlook 2019, 2016, 2013, 2010, 2007, 2003, 2002, & 2000 profiles
- Supports encrypted, compressed, password-protected, and damaged OST files
- Splits converted PST files into 2 GB, 5 GB, and 10 GB sizes
- Recovery Mode option to convert corrupt OST files to PST file
Cons
- No option to compress or compact PST files
- Less number of supported output file formats
8. Kernel for OST to PST
Kernel OST to PST Converter is another reliable OST converter software for Windows that helps Outlook users to convert OST files to PST format. It retrieves user mailboxes from orphaned or inaccessible OST files and helps to migrate mailboxes to different email clients.
Features
- Converts OST to PST with accuracy
- Recovers lost or permanently deleted Outlook mailbox items
- Migrates Exchange emails to Gmail/Outlook.com accounts
- Advanced filters to refine mailbox items based on item type, date range, folder name, etc.
- Generates a graphical report after OST to PST conversion
Cons
- Most features are available only in paid versions
- No option to compact or split PST
9. ZOOK OST to PST Converter
ZOOK OST to PST Converter is one of the best tools to extract and export offline OST mailbox data to PST format. It helps migrate Exchange or IMAP Outlook OST to Outlook PST format. The tool also helps you access and convert orphaned or inaccessible OST to PST format in a few clicks.
Features
- Helps migrate emails, contacts, calendars, notes, etc. from OST to PST format
- Batch conversion for multiple OST files conversion
- Works without Microsoft Outlook
- Maintains Meta-Properties & RTF Structure of emails during OST to PST Conversion
- Repairs and converts orphaned, corrupt, inaccessible, crashed or cached OST Files to PST
- Supports all Outlook versions
- Option to split large-sized OST files into multiple small PST files
- Merges OST mailbox data to an existing PST
Cons
- Supports only a few output file formats
- Basic OST recovery features
10. Shoviv OST to PST Converter
Shoviv OST to PST Converter recovers inaccessible and corrupt OST mailbox items and converts them to PST file. The software also converts OST to HTML, EML, vCal, and vCard formats. It recovers lost or deleted mail items during conversion and can export the OST file to Office 365. It can convert an OST file of any size and split the PST file while saving the converted OST mailbox items.
Features
- Quickly converts OST files to PST format
- Recovers hardly deleted OST files
- Converts single or multiple OST files without any file size restriction
- Previews OST items before saving to PST
- Maintains the hierarchy of the folder and data integrity
- Supports all Outlook versions and Windows OS
- Option to search OST items via specific field name
- Option to save OST files in various file formats, such as HTML, EML, vCal, vCard, MSG, etc.
- Allows you to export OST mailbox items to Office 365
- Option to split PST file while saving
Cons
- No support for Office 2019 version
- Does not convert encrypted OST files
- Does not distinguish the deleted items
Conclusion
Based on the features, you can choose any of the above given top 10 best OST to PST Converter software as per your requirements. These software can help you migrate emails from Outlook Exchange or IMAP account to other Outlook or email clients, such as Apple Mail, Thunderbird, etc. You can also use them when you see common Outlook errors while accessing your account, such as The file xxx.ost is not an Outlook data file.
These software can help you resolve Outlook errors, recover lost or deleted emails, and import OST mailbox to Office 365, existing Outlook profile, or live Exchange directly. Out of these, Stellar Converter for OST is the best OST to PST software. It is often recommended by several MVPs and admins across the globe. There’s also an OST to PST converter study carried out where Stellar Converter for OST outperformed all the other OST converter software in the industry on several parameters.