You can use the free VMware Converter Standalone to move a physical machine to ESX(i). As soon as you have it on ESXi you can easily move it to ESX, depending on your infrastructure.
If you web server is W2K3 you don't need to reboot it when you use the VMware Converter to migrate it while it is online. You just need to enable VSS.
If you have W2K one rebbot is needed to install the open file agent.
Look here: http://downloads.vmware.com/d/info/datacenter_downloads/vmware_vcenter_converter_standalone/4_0
AWo
VCP 3 & 4
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