Migrate Mail Archive to new box

Had a ClearOS 7 box compromised and running minerd. Was able to stop the mining and get the box settled but do not trust it. Will be moving mail to new box. Zarafa community should be pretty straight forward. I've done sqldump from old box and import database into the new one. My question is what is the recommended method for moving the mail archive so that the new box will be able to search the old mail archives. Never have figured this out but we've always went from different versions of OS and Zarafa. Anyone have some pointers?