dovecot - Jul 2010 - Migrating to dovecot configuration questions

I am currently running a mail server on an earlier version of Red Hat 
Advanced Server, sendmail and UW IMAP (imap-2007e). I am considering 
changing to Dovecot for IMAP but have a few configuration questions 
in regards to a hashed directory setup.

Right now the mail spool for everyone's mailbox is located in 
/var/mail/first letter of email address/second letter of email 
address, for example ajaym would be found in /var/mail/a/j ,email 
address john would be in /var/mail/j/o  and so on.....

Most users using IMAP have a home directory where they can store 
their personal folders, trash, sent items, etc.. in /home/username.

I am looking for some configuration information on making  a smooth 
transition from UW IMAP to Dovecot and keeping the existing directory 
structure.

Any info or suggestions??

Thanks
Adam -

On 14.7.2010, at 0.50, Adam wrote:
> Right now the mail spool for everyone's mailbox is located in
/var/mail/first letter of email address/second letter of email address, for
example ajaym would be found in /var/mail/a/j ,email address john would be in
/var/mail/j/o  and so on.....
So that would be the INBOX.
> Most users using IMAP have a home directory where they can store their
personal folders, trash, sent items, etc.. in /home/username.
This would be the mail root directory. Probably you can use the home directory
that's in passwd.
> I am looking for some configuration information on making  a smooth
transition from UW IMAP to Dovecot and keeping the existing directory structure.
mail_location = mbox:~/:INBOX=/var/mail/%1n/%1.1n/%n

Although you should consider moving the mails from home directory to e.g.
~/mail/ directory. Would help to avoid trouble in future.