365 most likely would be the way to go, but since I SOld the business and properties we don't really use Office much any more. But when we do, we use Access, Excel, Word & Powerpoint (very little). 365 I $99.00 a year....I guess I am anal with a subscription. As you can tell with my Office 2003....go 10 years out of it. Although I have found and seen Office 2010 with all of the option for 3 PC's and less than $200.00. But my 2003 still works well. I just Googled and found a conversion program that runs separately to convert the new Excel files.