I found the answer to my own question -- hope it helps the other people.
Here's a clip from "lynx /usr/share/doc/pine-4.44/config.html" :
=============================================================================
disable-these-drivers
This variable is a list of mail drivers which will be disabled.
The candidates for disabling are listed below. There may be
more in the future if you compile Pine with a newer version of
the c-client library.
+ mbox
+ mbx
+ mh
+ mmdf
+ mtx
+ mx
+ news
+ phile
+ tenex
+ unix
The mbox driver enables the following behavior: if there is a
file called mbox in your home directory, and if that file is
either empty or in Unix mailbox format, then every time you
open INBOX the mbox driver will automatically transfer mail
from the system mail spool directory into the mbox file and
delete it from the spool directory. If you disable the mbox
driver, this will not happen.
============================================================================
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