in a few days i get my new server. on this server i will install vmware esxi 4.1 with 64bit.
today i have the zimbra server on an i386 machine.

whats the best way to move from i386 to x86_64 installation without loosing settings and data?

current version: Release 6.0.6_GA_2324.RHEL5_20100406144520 CentOS5 FOSS edition.
os: CentOS release 5.4 (Final) i686

greetings from austria