I'm testing the Zimbra 5.06 (32bit x86) on CENTOS 5. My university staff email is running on Openwebmail. If things run smoothly under the current testing, we might move to Zimbra running on 64bit x86.Does any body use Zimbra in their production environment? We've about 400 staff. The currrent server has 4 cores Xeon processor, 8 GB RAM and 4x 750GB SATA drives.