choosing backend for openldap

[Antuan Avdioukhine <antuan@cplus.ru>]

Greetings.

I'm novice in OpenLDAP as well as LDAP itself. Having a task to setup
mail system totally controlled by LDAP I'd selected an openldap +
sendmail + courier. But since it will my first OpenLDAP installation I'd
found quite diffcult to choose proper backend. Futhermore, the system
will be business critical after too short testing period and changing
backend seems to be unwanted enough. Is there some references? Any helps
or links are ok. Thanks. 

-- 
Antuan Avdioukhine (DEKA-RIPE).
Convey Plus Telecommunications
St.Petersburg, Russia.