You can view multiple OST files at once using the SysInfo OST Viewer Tool. Install and launch the software, then use the Load Outlook OST option to select multiple OST files simultaneously. The tool supports batch loading of multiple OST and PST files, including ANSI and Unicode formats, allowing you to review mailbox data without needing an active Outlook, Exchange, or Microsoft 365 profile. After loading the files, you can expand their folders and preview emails, attachments, contacts, calendars, notes, tasks, headers, MIME data, and RAW HTML. The software also provides Smart Search filters such as From, To, Subject, Date Range, and Has Attachments to help locate specific emails across large datasets. Once you have reviewed the required data, you can export emails to PST, EML, MSG, PDF, MBOX, or CSV formats. This makes it a convenient solution for users who need to inspect multiple OST files efficiently without opening each file individually in Outlook.
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