Coolutils offers several licensing tiers for different needs: : For home use on up to two computers.
Click . The software will show a progress bar as it rebuilds the database structure. Once completed, simply open Microsoft Outlook, navigate to File > Open & Export > Open Outlook Data File , and select your new PST to instantly access all of your recovered data. Technical Specifications & System Requirements Version: 2.1.0.63
Version 2.1.0.63 is not the latest (as of 2026); newer versions may support more Outlook updates or Office 365 OST variants.
If command-line is available:
Disclaimer: This article is for informational purposes. Always back up original OST files before conversion.
All file attachments embedded within emails are extracted and re-embedded into the resulting PST file without corruption.
Managing offline Outlook data files requires reliable software when server connections fail or migrations occur. Coolutils OST to PST Converter 2.1.0.63 (-x86 x64 architecture) provides a dedicated utility to convert unreadable OST files into accessible PST formats. This technical overview covers the features, architecture, and step-by-step application of the software. Understanding the OST to PST Transition Coolutils OST to PST Converter 2.1.0.63 -x86 x6...
: Useful when migrating legacy on-premise accounts to cloud infrastructures like Microsoft 365 or Google Workspace.
: It supports converting single or multiple OST files in one go, which is useful for IT professionals handling multiple mailboxes.
An OST file acts as an offline cache for Exchange, Office 365, or IMAP accounts. Unlike a PST file, which can be moved and imported into any Outlook client, an OST file is bound via security keys to the specific mailbox configuration and profile that created it. Once completed, simply open Microsoft Outlook, navigate to
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Common scenarios requiring external conversion software include:
Using the Coolutils OST to PST Converter is a straightforward, three-step process. Here is a quick guide on how to use it: Always back up original OST files before conversion