There are mainly 4 groups of files used in openwebmail.

1. cgi-bin/openwebmail/         cgi scripts/configurations/languages/templates
2. data/openwebmail/            background/icons/image/sounds
3. ~user/mail/                  user folder files/indexes
4. /etc/mail/virtusertable      virtual user mapping table


data/openwebmail/               mapping to url http://your_site/openwebmail/
------------------------------
doc/                            text document for openwebmail
images/                         runtime image/background/icons
sounds/                         various YouHaveMail sound files
openwebmail.html
index.html@


cgi-bin/openwebmail/            mapping to url http://your_site/cgi-bin/openwebmail
------------------------------
etc/                            configuraation, template, language, temporary files
uty/                            debug uty or tool used by sysadm

auth_ldap.pl                    various authentication modules
auth_mysql.pl
auth_mysql_vmail.pl
auth_pam.pl
auth_pam_cobalt.pl
auth_pg.pl
auth_pgsql.pl
auth_pop3.pl
auth_unix.pl
auth_unix_cobalt.pl

filelock.pl                     modules containing routines used by openwebmail
iconv.pl
iconv-chinese.pl
iconv-japan.pl
lunar.pl
maildb.pl
mailfilter.pl
mime.pl
ow-shared.pl
pop3mail.pl

openwebmail-abook.pl            CGI programs of openwebmail
openwebmail-advsearch.pl
openwebmail-cal.pl
openwebmail-folder.pl
openwebmail-main.pl
openwebmail-prefs.pl
openwebmail-read.pl
openwebmail-send.pl
openwebmail-spell.pl
openwebmail-viewatt.pl
openwebmail.pl                        

openwebmail-tool.pl             command tool of openwebmail
vacation.pl                     vacation utility for auto reply


/usr/local/www/cgi-bin/etc/        
------------------------------
openwebmail.conf                customized configuration file
openwebmail.conf.default        default configuration file
openwebmail.conf.help           help for default configuration file
smtpauth.conf                   file to store username/passwd for SMTP auth

styles/                         various CSS files
lang/                           translation files for various languages
templates/                      template files for various languages
sites.conf/                     configuration file for different virtual domain
users.conf/                     configuration file for different user
users/                          user directories (used only if use_homedirfolders disabled)
sessions/                       directory to store temporary session files

address.book                    global address book
calendar.book                   global calendar book
filter.book                     global filter book

b2g.map                         Chinese Big5 to GB charset mapping file
g2b.map                         Chinese GB to Big5 charset mapping file
lunar.map                       Chinese lunar calendar mapping file

b2g.db                          index db of b2g.map
g2b.db                          index db of g2b.map
lunar.db                        index db of lunar.map

etc.mail.virtusertable.db       index db of /etc/mail/virtusertable
etc.mail.virtusertable.rev.db   reverse index db of /etc/mail/virtusertable


for each USER
------------------------------
~USER/.forward                  mail forwarding file
~USER/.vacation.msg             text for auto reply
~USER/.vacation.db              db for autoreply history log
~USER/.signature                signature file
~USER/mail/.signature           signature file if ~USER/.signature doesn't exist
~USER/mail/.openwebmailrc       openwebmail user preference 
~USER/mail/.release.date        the release date of openwebmail which user used
~USER/mail/.history.log         openwebmail user log file

~USER/mail/.from.book           from address book
~USER/mail/.address.book        address book
~USER/mail/.pop3.book           pop3 book
~USER/mail/.filter.book         filter book
~USER/mail/.stationery.book     stationery book
~USER/mail/.calendar.book       calendar book

~USER/mail/.trash.check         file that marked the last trash-cleaning date
~USER/mail/.pop3.check          file that marked the last pop3 retrieval date
~USER/mail/.filter.check        file that marked the last INBOX filting date
~USER/mail/.notify.check        file that marked the last calendar email notification check date

~USER/mail/.filter.book.db      db to store filtering count/date of filter rules
~USER/mail/.search.cache        cache file to store last search result


for each FOLDER in the ~USER/mail/
----------------------------------
~USER/mail/FOLDER               the folder file in mbox format
~USER/mail/FOLDER.db            the index db of the folder file
~USER/mail/FOLDER.cache         cache file to store last folder list result


other files accessed by openwebmail
-----------------------------------
/etc/mail/virtusertable         virtual user mapping file
/var/mail/USER                  INBOX for the USER
/var/log/openwebmail.log        openwebmail system log file

