Convert MBOX to PST for free using built-in tools and limited free utilities. The most reliable no-cost method is Thunderbird + Outlook via IMAP: add your MBOX into Thunderbird, connect the same IMAP account in both Thunderbird and Outlook, copy mails from MBOX folders to the IMAP account in Thunderbird, then let Outlook sync and export to PST via File > Open & Export > Export to a file > Outlook Data File (.pst).
If you prefer direct conversion, some tools offer constrained free tiers: Outlook Freeware “Convert MBOX to PST” add-in works locally with Outlook installed (free for personal use, check limits). vMail online converter is free up to 100 MB per MBOX; larger files require paid desktop software. Microsoft Store apps and trialware often allow 25–30 items per folder or a small batch to PST at no cost—use for small jobs or to test before upgrading.
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