[Dovecot] Want to have some users with Maildir, some with mbox

[Stewart Dean]

Want to have some users with Maildir, some with mbox, as I migrate from 
mbox format to maildir over the space of a month.  After everyone is 
converted to maildir, I'll change the mail_location in dovecot.conf.  
During the interim, can I use the Custom mailbox location script (at the 
bottom of the Mail Location DC Wiki page)?

if [ -d $HOME/.maildir ]; then
  export MAIL=maildir:$HOME/.maildir
else
  export MAIL=mbox:$HOME/mail:INBOX=/var/mail/$USER
fi
  
Questions:
1) What does explicitly specifying MAIL this way override?  The 
dovecot.conf mail_location variable?
2) My mail_location var is defined as:
mail_location: mbox:~/mail:INBOX=/var/spool/mail/%u:INDEX=/var/dcindx/%u

and my prospective maildir INBOX and mail folder root is to be 
~/Maildir.  So would I change the above to:
if [ -d $HOME/Maildir ]; then
  export MAIL=maildir:$HOME/Maildir:INDEX=/var/dcindx/$USER
else
  export MAIL=mbox:$HOME/mail:INBOX=/var/spool/mail/$USER:
INDEX=/var/dcindx/$USER
fi 
Question 3:  When converting existing users from mbox to maildir, should 
I delete the index contents?

Thanks in advance!

dovecot -n output

# 1.2.8: /usr/local/etc/dovecot.conf
# OS: AIX 3 0001378F4C00  
listen: *:143
ssl_listen: *:993
disable_plaintext_auth: no
verbose_ssl: yes
login_dir: /var/run/dovecot/login
login_executable: /usr/local/libexec/dovecot/imap-login
login_processes_count: 12
login_max_processes_count: 774
max_mail_processes: 1280
mail_max_userip_connections: 12
verbose_proctitle: yes
first_valid_uid: 200
mail_location: mbox:~/mail:INBOX=/var/spool/mail/%u:INDEX=/var/dcindx/%u
mbox_write_locks: fcntl
mbox_dirty_syncs: no
lda:
 postmaster_address: postmas...@example.com
auth default:
 passdb:
   driver: pam
 userdb:
   driver: passwd


--
==== Once upon a time, the Internet was a friendly, 
neighbors-helping-neighbors small town, and no one locked their doors. 
Now it's like an apartment in Bed-Stuy: you need three heavy duty 
pick-proof locks, one of those braces that goes from the lock to the 
floor, and bars on the windows.... ==== Stewart Dean, Unix System Admin, 
Bard College, New York 12504 sd...@bard.edu voice: 845-758-7475, fax: 
845-758-7035