Hi, Apple Store just delivered my first Mac, a MacBook, and I got some problems. It came with Mac OS Leopard or something installed if that's important. I tried to install Microsoft Office but it didn't work. Office 2003 shows up on the Dekstop but the installer does not work. I tried it with a PC and it worked so I know the disc is not torn. When I close an application, it doesn't shut down. The application is still viewable when switching between other applications. Is there any way to shut down applications? I had to restart the whole machine to shut them down. Another weird thing is that the green fill screen button does not work. Windows are resized but they do not fill the whole screen. Why? I couldn't find Internet Explorer. Is that installed or do I have to download it? I was told that Mac OS is based upon Linux. What does that mean? I don't know anything about Linux except that they got a penguin as symbol and I haven't seen any penguins in this Mac. Thanks.