Install ESXi 3.5 /4.0 on a desktop machine.
The key part of this is to check VMware whitebox list to see if your hardware is on the supported liet or not.
Google "ESXi on a whitebox".
How to copy (upload) file to ESXi server?
You can now copy files to and from the datastores with the Browse Datastore function in the VI client. On the Sumary or Configuration \ Storage page for the host, right click on the datastore and select Browse Datastore. On the Browse Datastore window you'll see icons to upload / download and move files.
How to enable SSH?
ESXi shipped with SSH but by default is disabled. You can enable it manually but please note this is not supported.
1.Logon to ESXi console unsupported mode
At the console of the ESXi host, press ALT-F1 to access the console window.
Enter unsupported in the console and then press Enter. You will not see the text you type in.
If you typed in unsupported correctly, you will see the Tech Support Mode warning and a password prompt. Enter the password for the root login.
2.Modify /etc/inetd.conf to clear the "#" that begin with #ssh and save.
3.Restart management service
command: /sbin/services.sh restart
Find more details from this link:
And this one: How to access the VMware ESXi hidden console
How to import existing virtual machine created by VMware server v1.02 to ESXi?
Use the free VMware vCenter Converter (4.0):
locate source virtual machine file
setup destination: IP of ESXi 4.0