I'm about to upgrade from Snow Leopard to Lion. I have a question about TurboTax however. I did my 2010 tax return on this computer and plan to do my 2011 tax return as well. Last year was the first year I have used TurboTax. I am thinking of doing a clean installation of Lion. When I install TurboTax next year and start to work on my 2011 tax return, what does it look at to get my previous years information? Does it just ask me for the file from last year's return (.tax2010 file extension)? Or are there some TurboTax configuration files somewhere on my system that I will need to have awareness of?