Non-technical phpBB migration
Its going to cost $200 to $500 depending on group size where size goes from "under 1000" to "tens of thousands".
You'll need to find a host and buy a domain name (I can advise on that).
Currently it WON'T run a listserv, which means you can't post to the group by email and users will not be sent new posts by email.
However we are working on an extension for phpBB which will let you run a listerv that also posts to the forum.
You'll need to find someone to admin the site.
You should maybe consider a transfer to groups.io
Contact me here