Upgrade from Business x64 to Ultimate x64 - possible ?

[Yacek]

I'm currently running Buisness x64 on my T61p.... just thinking about upgrade to Ultimate x64. What are essential differences between the two? As quite new to Vista - is such upgrade possible from installlation DVD without re-installing everything, I mean keeping all settings and software installed?

[GomJabbar]

Windows Help and How-to Upgrade to another edition of Windows Vista

[Yacek]

things seem to be not so easy after SP2...

Installation DVD is of January 2009 and including SP1. But I got SP2 and newer fixes already installed. This means no upgrade possible until I have newer OS installed on my laptop.
Now I can go only with new install.... mayne later :p