Free, open-source, local-first mbox → Outlook PST converter
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Updated
Jul 29, 2026 - C#
Free, open-source, local-first mbox → Outlook PST converter
Free Open Source Tool to merge multiple Outlook PST files into one. Supports 2TB+ file sizes, removes 50GB limit, and works with Outlook 2013/2016/2019/365.
How to repair corrupt Outlook PST files — compare free online PST repair vs desktop PST repair tool
Shrinks bloated PST files for devs who need faster Outlook backups and archiving
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