Thanks for speedy reply, that clears up the confusion
So to confirm, Zimbra 5 will officially support openSUSE 10.2.
I assume there are probably no plans to officially support openSUSE 10.3 when its released.
I hope there are no big differences between 10.2 and 10.3
as I am planning if possible to run Zimbra 5 on openSUSE 10.3
I will let the community how I get on, and will probably post another unofficial openSUSE installation guide for others who want to do the same