http://www.icyphoenix.com/viewtopic.php?f=30&t=337&p=8768#p8768
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Mighty Gorgon
Tue 13 Feb, 2007 12:22

Re: Migrating From PhpBB XS To PhpBB Vanilla
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[quote user="Pyron" post="8758"]I try only bbcode.php change but change with viewtopic.php  :( 

If change my old portal system bbcode.php replace icy portal system bbcode.php have any problem?[/quote]
No... you should not have any problem, but old bbcodes won't be parsed correctly if you do not add them to bbcode.php.

I mean only the bbcodes which are not integrated in Icy Phoenix... like the MARQ= it has been replaced with MARQUEE... so you should change your old posts to reflect this, or add the old tags to bbcode.php.