Hi, posting this on behalf of my father in-law. He has a 2007 MacBook Pro and mainly uses it for work ... emails, internet and lots of Microsoft Excel work. He's having problems editing clients' Excel spreadsheets as the software's too old. Can anyone suggest whether he should get a newer MacBook, or whether the newest version of Excel will be a worthwhile investment (£120 short term vs £900 long term for a new computer)? I know Mac likes to make it very difficult for people with older computers to work with any software going. Any advice welcome, many thanks.