How to migrate Outlook 2003 contacts [address book] into Thunderbird?
I think this is clear [?]
I think this is clear [?]
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If you are able to install and run Outlook and Thunderbird side by side on the same computer, then the built-in Import utility in Thunderbird may be your best bet.
Otherwise, you need to export your Outlook contacts data to an intermediary format which can be imported into Thunderbird. Both systems will support CSV ("comma separated values") files and you may be able to use vCards or vcf files.