migrate zimbra to new OS, 64 bits

[adv]

current status:
Release 5.0.4_GA_2101.RHEL4_20080321155827 CentOS4 FOSS edition
running on CentOS 4.7 - 32bits

Now, I want to move to the latest version of Zimbra, on CentOS 5.2 - 64bits. I have checked the wiki, and there is a tutorial for network edition only. So, my questions are

1. Do those steps can be applied to FOSS edition?
2. Can I use CentOS 5.2, or will need to keep CentOS 4.7?
3. It seems I will need to install the same version of Zimbra on new server, restore, then upgrade to the latest version, is that correct?

Please advice.
Thank you.

[phoenix]

Use this information information to achieve the migration. Make sure you take a backup of before and after the migration.

[adv]

How about the OS question? Do I need to keep the same OS? Or I can install CentOS 5.2?

Thanks.

[phoenix]

Yes, you can use CentOS 5.2.