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Mail Terrier is a Windows desktop tool from Coolutils that scans drives to index and search email files across PST, OST, EML, MSG, MBOX, and MIM formats without requiring Outlook. It supports advanced keyword searches with filters (sender, recipient, subject, date, proximity), previews emails (HTML, text, headers), and exports results to PDF, TEXT, TIFF, EML, or MSG, and exports result lists to PDF, XLS, or DOC. It is marketed for legal, forensic, compliance, and IT use, with a free personal-use option and a commercial license priced around $199.
AI named MailTerrier from February 2026 to March 2026.