I don't use 2010 but I have Publisher 2000 and there is not a lot of difference between those two. You do get more templates. But to buy 2013 if you already have 2010, I don't think you will get that much more.
You can save files from Publisher 2003 into the 2012 software but you can't save the 2010 into the 2003.
I prefer to work with Publisher over Word because it's easier to use and is user friendly.
I looked on the Publisher 2010 box and the only thing I saw was a "90 day technical support" The box also offered an email address www.office.com. I guess the next step would be to contact Microsoft or at least a dealer who sells the product. Good Luck !