importing threads and replies from flat file
 

We have an old in-house written system that we want to convert into vbulletin.
We can export the data from this system into a flat (csv) file with 4 columns:
- date of post
- thread title
- thread content
- reply content (there would only be one reply in each thread).

I am gathering that the Impex system does not support this, only users can be imported from csv files.

So the question is, how can we get this done, we understand that we would likely need to pay for this.

Thanks,