Is it easy to merge forums with an IPB 3.2 forum? I want to know before trying it out and ruining everything
Sometimes it is, sometimes it isn't. IPB is very unpredictable when it comes to their merging system, I have had merges with it that have gone smoothly and others that have been impossible so I have had to use vBulletins impex to do the job.
The convertors are available here - http://www.invisionpower.com/suite/convert.php Conversion FAQ - http://www.invisionpower.com/suite/convert_faq.php
It depends what. I believe the easiest would be to merge 2 forums with same software. But even that has its bad things. My friend was merging his 2 VB forums and one of them completely got erased. So pretty much he just transferred one from to another domain.