Possible to import into an existing forum?
I've got a client who is using vanilla forums (appears to be the cloud version, not self-hosted) and they came across some old forum data from some Yahoo groups that they were wanting to bring into their existing forum in the form of legacy or archival data.
I did some digging and saw that Porter can import mbox data, but it also looks like Porter is intended to be for migrating from one platform into a clean vanilla forum, not something with existing data.
So my first question is: is what they're asking for reasonable? I'm sure it's possible given enough time and effort, but for legacy data, they're not going to want to devote more than a couple hours to it, I'm sure.
If it's reasonably possible, is there a tool like Porter that will import into an existing forum without nuking the existing posts and users and such?