When a large Outlook OST (offline storage) file gets damaged in a file corruption incident, all of its data, including messages and attachments, instantly become inaccessible for viewing and editing. The same situation takes place when the account that a particular OST storage file is associated with, is deleted. Such situations require specialized third-party tools capable of opening OST data files and making them readable again.
OST Viewer Tool is a small, easy to use, yet powerful and fast solution for viewing damaged or unreadable Outlook OST files and extracting data from them. The program was specifically designed for non-professional users and contains just a few controls for file selection, content preview and data recovery. The built-in content browser enables users to view readable records of a damaged or healthy file and the powerful conversion engine makes it possible to save them in a safe location as an Outlook PST file or a set of *.MSG/*.EML/*.VCF files on the hard drive. All of these features make OST Viewer Tool not just a powerful OST file viewer, but also a convenient OST to PST, OST to EML, OST to MSG and OST to VCF converter that can be used both for data recovery and migration from Outlook to alternative email clients. When analyzing the content of damaged files and recovering data from them, the software makes no modifications to their structure, thus making it possible to resort to alternative solutions in case of a failure. OST Viewer Tool requires a copy of Microsoft Outlook to be installed on the user's system for data recovery to take place.
The trial version of the program that can be downloaded from the official site free of charge features full file viewing functionality, but limits the number of recoverable objects to 5 per folder. Purchasing the full version removes all limitations and enables users to recover any number of objects from OST files as large as 32 TB.

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