I am new to Zimbra, I have a client that have a Zimbra 6.06, we want to upgrading to the latest Zimbra server version, I believe is version 8.0.

Do you think it 's a good idea to upgrade directly from verstion 6.0 to version 8.0, or I need to upgrade in stages?

Would it be a better idea to install a fresh version of Zimbra 8 and import the settings and messages from version 8?

is there a good wiki or how-to for upgrading from version 6 to the latest version of Zimbra?

Please help,

Thank you,