Upgrade from 7 to 8

Hello,

A question…

We currently are running Lotus domino 7.02 and Lotus Sametime 7.5 (on linux)

Now, I want to try to upgrade to Lotus Domino 8.x.

How should I proceed if I’m using Sametime + Lotus domino? can I upgrade Domino without upgrading Sametime? Do I need to upgrade sametime first? etc…