You should be OK. What the EULA states (in its extremely long-winded way) is
that you can install it on a desktop and a laptop providing only one is used
at any time. So if you are away from your office using Word 2007 on your
laptop, no one else should be using the other copy on the desktop at work.
However, if you are only concerned about compatibility, you can download the
free Office 2007 compatibility pack and install it on your desktop at work.
This will let your work computer open and save the Word 2007 file format and
will get all the new fonts that come with Word 2007. Obviously, if you use
any of the features that are exclusive to Word 2007, the work computer will
not see them, so it isn't 100% compatibility. However, if you documents are
going to passed to anyone else without Word 2007, you should probably avoid
using those features anyway.