I started out using OOo back before you could read/write in .doc format
0.x.x or 1.x.x.
When LO came around, I switched to it.
I am currently using both 4.0.5 and 4.1.1 between my desktop and laptops.
What do you refer to as a "primitive Win7 box"? I have a laptop that is
from 2007 or 2008 that ran Vista, but now runs Win7 Professional. Also,
I have one that I bought this year that runs Win7 Home Premium. Both
are dual booting for Ubuntu and Win7.
I have had little issues with LO on Win XP [still have a laptop with
that], Win Vista [gone], and Win7 systems.
Also, there is the "collaboration with heavy editing" statement. Yes,
even if you have Win7 and Word 2010 on both systems, you still could
have collaboration issues. I know of people that could not get it all
of the "bugs" worked out to "collaborate" with each other sharing the
files via email. They did not want to use "the cloud".
I have not read the other posts in this thread, but are you using any
collaboration add-on or are you using the "internal" options for Word
20?? and LO.