Sharepoint Foundation 2010 Upgrade to Sharepoint Server 2010

Hello everyone,

this seems to be a stupid question but I've been searching Google for days.

In my Company we are using Sharepoint Foundation 2010 and we want to upgrade to Sharepoint Server 2010.

SharePoint Foundation 2010 is for smaller organizations or departments looking for a low-cost entry-level or pilot solution for secure, web-based collaboration. SharePoint Foundation 2010 is the underlying infrastructure for SharePoint Server 2010 and is the new version of Microsoft Windows SharePoint Services.

SharePoint Server 2010 is the business collaboration platform for the enterprise. The consolidation of collaboration solutions onto SharePoint 2010 makes it possible to cut costs by lowering training and maintenance expenses and increasing IT productivity.

Is there anything to pay attention on like system- or sorftwarerequirements?
How to do it?

Thanks a lot

eyrieme