My failure was to set up authentication with AD and the users did not complete the Zimbra / LDAP!
Ref: Login failed / webmail
After installing the version zcs-5.0.9_GA_2533.DEBIAN4.0.20080815215219 in HP/ML110-G5 server using Debian 4.0r4a or Ubuntu Server 8.0.4.
Does not as common user login!
Only log into webmail with user ADMIN or member of the group administrator !
Someone knows how to solve? Has anyone ever seen?