I am running Virtualmin 3.99 on Ubuntu server 12.04.
When I create a new virtual server, the administration user has no Maildir created in the home folder and cannot login to usermin. However if I add additional users to the server, the Maildir is created correctly in "homes/[user]/Maildir" and everything works fine for the second user.
When creating the server, there is no error messages. The output even reads "Creating mailbox for administration user .. .. done".
Many thanks, Will