Here is the OLM to PST Converter tool which keeps your data intact.
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Convert OLM to MBOX, Anything and Everything you need to know!
Anything and Everything you need to know about how to convert OLM to MBOX is this: OLM Extractor Pro.
EML to PST Converter (Precise, Safe and Accurate)
Precise, Safe and Accurate – words that perfectly define the best EML to PST Converter: Mail Extractor Pro.