https://www.icyphoenix.com/viewtopic.php?f=35&t=6602&p=45374#p45374
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Mighty Gorgon
Mon 26 Oct, 2009 16:58

Re: I Am Going With Icy Phoenix But I Need Help First
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[b]AndyGpy[/b] is correct about phpBB 3 styles and mods: they won't work in Icy Phoenix unless you (or someone else) will recode them for you.

Regarding porting users, forums and posts, currently there is no easy way, and I discourage doing it unless you have really good reasons. Better reinstalling from scratch, but think twice about that... you won't be able to revert back. :wink: