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I can tell you from experience that Impex works pretty darn well importing phpBB with the category hierarchy mod (subforums). I worked with the Impex developer to get it working better.

It's not perfect, but for my forum, it imported about 90% of the subforums perfectly. The other 10%, I just needed to move to the appropriate location. Posts/Threads/Attachments/Users, etc. imported without a problem.

Originally Posted by Omeraki

Ok thank you; one more quick question. One of my friends did basically the same thing I did (Only with regular phpBB) and he had a really hard time with the conversion. He used phpBB2, and impex; and he said the importing worked fine until he got to posts, when all it did was do like 2 rounds of the posts, and then just hanged and didn't do anything. And he only had like 20,000 posts (and impex would hang after about 8,000 of them)

I have 40,000+! Am I going to experience similar problems?

Another problem I had that caused Impex to hang was the amount of memory allocated to the script (PHP). I had to configure this from the default of 8MB to 32MB I think. Then Impex stopped hanging.

Impex asks you how many posts you want to transfer per cycle. One thing you can try is to lessen the default cycle number to a lower number. For example, I think the default is 2000 posts per cycle. Reduce this to say, 500. It will take longer for the script to run, but it may keep the script from hanging.