Thanks for your fast reply Ryan. I can follow your thoughts ... it´s really a hairy situation, indeed. Following situation: At the weekend I converted my vbuleltin board to ips4. Because of the limitations (of the official converter tool) I wasn´t able to convert all of my vbulletin prefixes. This is why I used an own written script beforehand to convert all prefixes to tags. https://community.invisionpower.com/topic/409717-converters-migrating-vbulletin-thread-prefixes/?do=findComment&comment=2538474 Afterwards the converter was able to handle these information. Do you think it´s possible to convert my existing tags to prefixes? If that is the case I can do without min/max tags settings per forum.