At work I use Microsoft Excel and Powerpoint daily as my main productivity tools. But at home, I’m using an Apple iMac which has a horrible implementation of Microsoft Office (super slow to start up). So instead of trying to use a Microsoft product on my Mac, I’ve chosen to install and use the freeware package called Apache OpenOffice. This is basically a replacement for Microsoft Office (written in Java, I believe) and it works great. Best thing about it, OpenOffice is available for the Mac, Windows, and Linux machines.
The “Office” suite is very easy to use, and I especially like the ability to open xls and ppt files, and conversely save my OpenOffice files in that same format. I’m sure there may be some compatibility issues when using complex features, but so far so good!
I highly recommend checking out this freeware suite of products if you’re using a Mac and want to have similar tools as Microsoft Office.