Rick Broida in an article for c/net reviewed a Microsoft alternative that he gave positive reviews to.
To check it out yourself, here’s a link to Kingsoft. 

This writer doesn’t feel so bad for not hearing of Kingsoft, because neither did Broida.  He goes on to say that he tested the product on an old laptop and realty liked it. 
Kingsoft Office looks a lot like Office 2010.  He describes the software like this, “the free version is extremely capable, offering robust counterparts to Word, Excel, and PowerPoint--and file compatibility with all three. It doesn't support Visual Basic or macros, however, so if you're a power user, you might want to consider the $69.95 Pro version, which adds those features (among others).

A final caveat…c/net staffers give the product 4 ½ stars out of 5.

So publishers, if you get sticker shock just thinking of either buying a new version, or upgrading to the latest version of Microsoft Office, you may want to check out Kingsoft Office.  After all, it’s free, so what have you got to lose.