Migrate VMware Server to ESXi

What's the recommended approach/tool to migrate VMs from VMware Server 1.0.7 (under Win2003 x64 Enterprise) to ESXi 4 ?

Some of the VMs are running Win2003 Enterprise x86, others run Ubuntu JeOS 8.04.

vmware converter will be the simplest way to do it. Once you have ESXi built and the vms copied to a location, just launch converter, you will be asked for the source machine then to give it a destination, that will be your ESXi server, then follow the steps, even if the import fails it will not affect your source vm.

There is also a standalone, commercial version of Vmware converter. It is a boot CD (coldclone.iso) that you can use to convert a machine while it is off. The disc contains a pre-installed Windows 2003 image that runs a built-in version of converter. Since you boot from the CD, none of the server’s processes start-up so you can get a good clone of the hard drive.

To be able to to download this CD image you need to be properly licenced.