I would echo what Cat33 said.  You can buy the version of Microsoft Office to download on your laptop.  I have looked on the Best Buy website, and it is there. 

I use a propriety program that is built off Excel.  It has macros in it.  This past summer that downloaded some different versions of spreadsheet programs, to try them out.  They don't seem to run this proprietary software that I use properly.  I suspect it has something - everything? - to do with how the macros were written.  I want/need to use this proprietary software, and I can't change it, so I am locked into using Microsoft Excel when using this software.