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It’s possible that:
Before committing to conversion, you can preview emails, contacts, calendar items, tasks, and notes. This allows you to verify the integrity of the source OST file.
Version 2.1.0.63 is not the latest (as of 2026); newer versions may support more Outlook updates or Office 365 OST variants.
You can download a 30-day evaluation copy from the CoolUtils OST to PST Converter official page to test its full functionality before purchasing. OST to PST Converter Free Download - CoolUtils Coolutils OST to PST Converter 2.1.0.63 -x86 x6...
The tool does not just scrape the text from your inbox. It performs a forensic-level scan of the OST file structure to recover: Nested folder hierarchies. Embedded email attachments and inline images.
| Free method (Outlook export) | Coolutils converter | |------------------------------|----------------------| | Requires working Exchange profile | Works with orphaned OST | | Cannot open corrupted OST | Can recover partial data | | Slow for large files | Optimized for large OST |
These are local cache files created by Microsoft Outlook to save a copy of your mailbox data offline. They are directly tied to a specific Exchange, Outlook.com, or IMAP account profile. If the server connection is severed or the account is deleted, the OST file cannot simply be opened by another Outlook installation. It’s possible that: Before committing to conversion, you
If you need to break free from Exchange server dependencies or corrupt Outlook profiles, Coolutils provides one of the best cost-to-feature ratios on the market.
: This version is optimized to handle large files (often exceeding 10GB) and can process multiple files simultaneously via a command-line interface or a simple GUI. Performance Specifications Operating System Windows 2000/2003/Vista/7/8/10/11 Minimum RAM Processor At least 2.4 GHz Disk Space Licensing Single-payment lifetime license with unlimited upgrades Practical Usage Scenarios
The software used less than 300MB of RAM during all tests and did not crash once. The output PST files were fully intact, and Outlook 2016 imported them without errors. The preview pane worked smoothly even on large folders containing 10,000+ items. You can download a 30-day evaluation copy from
The is a specialized tool designed to convert offline Outlook storage files (.ost) into accessible personal storage table files (.pst). It is primarily used to recover emails and data from orphaned, corrupted, or inaccessible OST files when the original Exchange server is unavailable. Key Features
Many recovery tools require an active connection to the domain controller or Microsoft Exchange Server. Coolutils operates entirely client-side. All you need is the standalone .ost file to extract 100% of its contents. 4. No File Size Limitations
You can choose to convert the entire file or select specific folders (e.g., only Contacts or only the Inbox).
Fully preserves original email formatting, folder hierarchies, dates, and attachments. Multi-Format Extraction: