We are looking at implementing Zimbra but as a small business (15 employees) we wanted the server to also do some intranet (Apache/PHP/MySQL) work for us as well. Nothing particularly heavy. Server is dual core Xeon w/ 4 GB ram and 150GB RAID 1 15,000rpm hard drives.
Without having Zimbra installed it's difficult to envision how users might pull up intranet sites. Would I have to run apache on a different port or should I not head down this street at all?