Thanks all for your invaluable input, I have tried to mark helpful and correct where I can but wasn't aware I was limited with my points?!?! So just would like to say thanks to all of for pointing me in the right direction and saving me hours and possible days.
Before I go do you have any advice on the best method/ where I should be looking to replicate our exchange 2010 server once I have it running on a VM ?. I'm now thinking that once it's on the VSA and the physical host goes down it can be moved to a new physical host within in the cluster us vSphere HA?
Thasnk for the link to the videos too, that's my afternoon at work planned 