I found this on another blog called VMwareTips.com by Rick Scherer (a VMware vExpert) that I frequent. He walks you through a VMware vCenter upgrade from 2.5 to 4.0. He also shows some “gotchas” that would normally come up during the upgrade, so I though it can be extremely useful for our customers who are planning on doing the upgrade themselves. Of course, if you need help or even just best practices on upgrading your enviornment, just contact your Lewan Sales Representative who can then engage one of the SE’s on our team! I’ll also add a new post for another video he has using Update Manager to upgrade ESX 3.5 to vSphere 4.

http://vmwaretips.com/wp/2009/06/01/upgrade-vmware-vcenter-25-to-40-video/