This myth has a little bit of background in the Globalization testing Myth# 12 . This post is rather an extension to the before-mentioned post.
While performing the Globalization testing, one of the key test environment specific decisions is whether to use native language Operating system or make use of MUI packs as Microsoft provides both the options for its users. The previous post does touch upon this aspect. As i delved more into this topic, i had a realization that MUI packs do not actually behave the same as the different flavors of Windows Operating systems. With a bit of research, i was able to arrive at the below table listing the differences between the way MUI technology works in Windows XP and Windows Vista. This information has largely been derived from the below mentioned sources.