Anybody know if the new '08 ibusiness spreadsheet software is fully compatible with excel spreadsheets (ie. visual basic like airboys spreadsheet) ? I would really like to get a mac, but I am trying to figure out how I would tune with it. The 7 year old HP is no longer cutting it. I don't exactly want to buy Windows XP to use via Leopard on the mac, but I am really considering it. Your thoughts.