8.x includes a UDM tool which is perfect for importing legacy articles, unfortunately this doesn't exist in 7.x and so instead you'll have to use either the 'Standalone Unsupported Converter' or alternatively the 'Knowledge Conversion Tool', however the latter will only import articles from a previous Remedy RKM version (i.e. 7.1/7.2/7.5).
Please see attached for documentation on using the unsupported conversion tool.
I hope that this helps.
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conversion_tool_howto.docx 401.4 K
Will check & update.