ichat from IRC told me that to do this I would probably do some LDAP trickery. He also said that waiting for Chris would be a good thing As he is the LDAP guru.
ichat also mentioned installing webmin on the directory server to assist with the directory edits.
HOWTO: Webmin Install - http://forum.zentyal.org/index.php?topic=3852.0
If there is any guru, (s)he is on Zentyal team side
Although I know LDAP pretty well thank to my parallel life aside Zentyal
I do not pretend to act as a guru for what concerns Zentyal implementation.
This said, be aware that I don't use Zarafa, focusing on Zentyal as "internet gateway" only
Last but not least, I would suggest NOT to use Webmin in parallel to Zentyal unless you understand the very - low level - detail of what you do with various Webmin modules and what could be the impact on Zentyal.
Back to your point:
- As jsalamero wrote, administration cannot be done via Zarafa but must be done using Zentyal. This is at least true for components and objects defined in Zentyal.
- I don't feel comfortable with Zaraf documentation (at least URL you provided) because it doesn't contain the righ level of detail permitting to understand:
-> what is the LDAP schema to be used when running such command
-> where in the DIT such entries will be created
so it definitely deserves further investigation