You probably all know by now that you can get support from Microsoft for a lot of their products running on top of a VMWare environment if you have a Premier Support contract with Microsoft. I was visiting Microsoft yesterday where I got the official statement that MOSS 2007 is one of the exceptions to that rule.
You read it right: Microsoft will not offer any support at all if any part of your MOSS 2007 environment is running on VMWare ! You will be asked to reproduce the problem on separet hardware not running ESX in any case.
So if any of you are planning and designing MOSS 2007 environments using VMWare ESX Server, I suggest to check with your Microsoft contacts to ask for this official statement regarding support.