ESXI 4.1 to 5 and running a virtual Mac

Upgrade from ESXi 4.1  to 5 is a doddle – follow those very detailled instructions together with printscreens and you can’t go wrong

Running a virtual Mac is pretty straightforward as well (at least on ESXi 5, hence the upgrade step for me above), get the patch here, follow the installation instructions that comes with it and hey presto, you now have Mac OS options appearing in your OS drop down options (under Others). Get yourself an ISO – JaS or IATKOS for the Intel-based hardware and everything installed fine!