Solidworks 2009 Installation Help

Hello all, I was wondering about the best practice onupgrading a SNL Server Installation & PDMWorkgroup ServerInstallation to 2009 from 2008.

Is it preferable to uninstall the previous versions first or justlet the Solidworks installation manager do the default option ofinstalling the software over the previous versions?

Thanks a bunch,
AaronSolidworksAdministration