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After you have done a dump of the phpBB2 tables, then imported them into your XOOPS db, run the converter as a mySQL query.
Having said that, I have been trying to do the same thing using a test installation of XOOPS and am getting errors. I am still trying to work them out.
Does anyone have a script that will work for converting phpBB2 to newBB2? The old script is for newBB1. Note that I have tried using it for both a newBB1 and a newBB2 installation.