A truly free, unlimited NSF to PST converter is rarely legitimate in 2025; most reputable tools provide a free trial that limits items per folder, not a full, no‑cost license. Trials typically cap conversion to about 25–50 items per folder and unlock bulk migration after purchase, which signals sustainable development and safer handling of Notes data. Beware “free full version” claims that bundle adware, require unsafe permissions, or bypass IBM Notes/Outlook prerequisites—these often risk data corruption, broken MIME/RTF, and privacy violations. Safer practice is to test with vendor trials, verify features like selective folders, preservation of hierarchy, encryption handling, large NSF support, and CSV/HTML previews, then buy only if test results match needs. For small jobs, export subsets with trials; for enterprise moves, choose audited vendors, run offline copies, validate counts, and preserve chain of custody. Always maintain backups, checksum outputs, and document every step for compliance.