found this via TinyApps.Org, a shareware tool to rotate/invert mouse movements either by X/Y axis or degrees (90, 180, 270, etc). the author, Moritz Franckenstein, has made available a trial version which deactivates after some time.. more info available here
(in English) even though the homepage is in German..
• Webpage: http://www.maf-soft.de/mafmouse/
• Source: http://tinyapps.org/...use_orientation.html