There are people who create scripts that can extract all public information from your forum. You can import that info into your new forum if you wish. I am not sure such an act is allowed with ProBoards. I mean whether there are any legal complications. If they simply do not allow exporting databases, such a script can work around that.
ZandraJoi All the themes we have downloaded, created, won't be applicable they said
I expect that they will give you more good looking themes. As for being desktop ready, most mobile-ready themes are toned down versions of desktop themes. So you are safe being a desktop-only customer.
ZandraJoi They said 18 months & that was last year sometime.
That is normal. It will usually take much more time than promised with free platforms. Not always, but mostly.