preferences question

[bwilson]

Hi,
   First of all, awesome project! I'm looking at using it to replace 
Outlook Web Access. So right now I'm using imap to get the mail off the 
Exchange servers, and LDAP to get at the address book.Works splendidly.

   Now my question/problem. To save preferences, and use/access a 
personal address book, do I HAVE to use sql or ldap authentication? If 
so, anyone have any tips/experience replicating NT domain passwords and 
LDAP?

Thanks,
Ben