I am planning my eventual migration from a physical 32-bit server running Zimbra 5 FOSS to a different physical 64-bit server running Zimbra 6 FOSS.
I have found some possible ways forward that I will need to test; however, I thought it would be worth checking if anyone has experience with such a migration and see if there is a recommend procedure.
Details are probably not pertinent, but here they are:
Users: ~50 / Mail Volume for # of users: Very high
Ubuntu 6.06 LTS (x86 - 32-bit)
Zimbra Release 5.0.6_GA_2313.UBUNTU6 UBUNTU6 FOSS edition
Pentium 4 @ 3.6 GHz / 4 GB DDRII / [x2 - SW RAID1] 250 GB SATA
Ubuntu 8.04 LTS (x86_64 - 64-bit)
Future Zimbra Release 6
Phenom II X4 @ 3.0 GHz / 8 GB DDRII / [x4 - SW RAID10] 1 TB SATA