I am just about to install Zimbra 5.0 RC1 onto openSUSE 10.3, will keep you posted
My experience is that there is very little structural difference between 10.2 and 10.3,
and since there is a zimbra package for 10.2 things should be smoother, but that said,
Zimbra 5 is still not at release stage, so other wierd things may happen
Cheers
bigmudcake