• Kartin Williams
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Thunderbird can only read files in MBOX format. OLM format is not supported well on Thunderbird. This is a reason, you will need to export OLM files to MBOX format first. In fact, there are several brands that offer the service. I have tried OLM converter Pro by GLadwev in the past and it was good to work with. To know more, take a free trial of the tool.