I'm looking for a free or open source software able to convert Gmail MBOX email archives to Outlook PST archives.
It can be a Windows 10 or MacOS X software, I'm also open to x86/x64 Linux command line tools.
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Follow these steps to convert Gmail MBOX to Outlook:
Visit this MS link for more information: Import Gmail to Outlook
There is a free Convert MBOX to PST utility available for Windows and Outlook. Please note that I'm one of the developers of this tool.