Hi. We have been using Zimbra FOSS edition (now 5.0.14) for many years, and it Rocks!
Now we are evaluating the Network Edition, and have installed 6.0.8 trial on a new Ubuntu 8.04 LTS server. We are trying many interesting Zimlets to create a really advanced web mail platform for our users.
However, users get no tabs in the preference view, and only see a page with "login options", "Searches" and "Other". On Zimbra 5 users have all the preference tabs like Mail, Composing, Signatures etc. I have been going over the Admin GUI numerous times to see if there is an option for this, but can't find any such option.