I got that old freebsd box converted to centos finally. Everything appears to work but...
In virtualmin/Edit Users I cannot edit a user account without getting the Home Directory already exists error.
System hostname mail.lucketts.net (18.104.22.168) Operating system CentOS Linux 6.4 Webmin version 1.630 Virtualmin version 4.01 Pro
Forum searches come up with old reports of similar problem due to sym links. I do not have any sym links on the centos box that I know if, but the original BSD box did have sym links.