Kernel OST Viewer

by KernelApps Private Limited

Kernel OST Viewer is a free Windows tool that opens Outlook OST files without Outlook or Exchange and previews their e-mails, attachments, contacts and calendar entries.

Operating system: Windows

Publisher: KernelApps Private Limited

Release: Kernel OST Viewer 18.0

Antivirus check: VirusTotal report

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Kernel OST Viewer is published by KernelApps Private Limited under the Kernel Data Recovery brand. The program opens offline Outlook data files (OST) without Microsoft Outlook or a connection to the Exchange server and shows the mailbox in its original folder structure. Healthy, orphaned and damaged files can be read, which helps administrators and users who need to check what an old OST file contains.

Reads the contents of orphaned or damaged OST files when the mailbox is no longer reachable.

After a file is selected, e-mails, attachments, contacts, calendars, tasks, notes and journals are previewed, and deleted items that can still be read are marked in red. Messages can be sorted and filtered by sender, subject or date, item lists can be saved as HTML, and file analysis reports summarise mail flow and item types. Viewing is free; saving items to PST, MSG, EML or PDF requires a paid Kernel tool.

Features:

  • Opens OST files without Outlook
  • Reads orphaned and damaged files
  • Preview of e-mails, attachments and contacts
  • Search and filters by sender, subject or date
  • Item lists saved as HTML
  • File analysis reports
Windows XP to Windows 11
Pentium class processor
64MB of RAM (128MB recommended)
50MB of free disk space

PROS
Free viewing with no file size limit.
Works without Outlook or Exchange.
Shows deleted items in the preview.

CONS
Saving to PST, MSG or EML needs a paid tool.
Available for Windows only.
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