If you are wondering if its possible so install esxi5 on a 5big (office) ,the answer is yes.

The way i did it, was to place the disc on a laptop with a esata connector
Then i installed esxi without any special option’s

After setup i placed the disc back into the 5big, and it did NOT startup
After some trail and error i was sure i needed to reset the netwerksetting, but there is no vga output so you need to do this blind.

I simulated the network reset on a other esxi system and i wrote down all the keyboard sequences.

The blind reset is:

0- hook up a USB keyboard on your 5big
1- wait until the system is started (wait 5 minutes, just to be sure)
2- press {f2}
3- press {enter} {enter}
4- press 4 times {down}
5- press {enter} {f11} wait 5 seconds, {enter}
6- press {esc}, wait 5 seconds, {f12} {enter} {enter} {f11}

Now the system wil reboot and if you have a DHCP server running, you will see that your 5big wil get a IP number, and you can connect

Because this system has only 2 Gb memory and not expandable, its not a very useful environment for a Esxi server.

At this time i’m not using the Lacie as a Esxi server, I made a downgrade to WHS2003
See this link for info: http://www.digisaster.com/?p=286

I will post some printscreens of the running esxi environment as soon i have the esxi bootdisc found.