One note for those wanting to participate, but may not have Excel (or Microsoft Office). You can download and install Open Office (Windows, MAC, Linux, etc) for free. It has almost all the functional of Microsoft Office, and will allow you to edit and view all of the Microsoft Office formats (Word, Excel, PowerPoint, etc).
It's what I use now on my Mac.
Download it for free here:
http://www.openoffice.org/ Just thought I would pass this along.
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