So for what I use my 2010 Air for, SL is just a better build at this point. Lion has spots of lag, worse battery life, runs warmer, and has broken certain features in programs I use constantly (Finale, MSWord, Coolbook). I need to downgrade, which I'll probably do simply by restoring from backup. My question is this: If I downgrade, will I be able to use files created under the Lion OS? I'm talking about Finale and MSWord files, along with certain PDFs. I plan to move them manually to an external, downgrade, and then move them back to the hard drive. I don't want to go through the trouble if the files will not work after this process. I hope someone can help. Thank you!