Windows Live Academic Vs. Google Scholar
Microsoft has created its own ad-free academic search engine, Windows Live Academic, to rival that of Google's (Google Scholar).
Like Google Scholar, Windows Live Academic allows researchers to search the contents of academic journals to find abstracts and, in some cases, full text articles from the publishers' sites. It also features a split-screen for previewing the contents of a particular result.
However, unlike Google Scholar, Windows Live Academic doesn't yet have a feature for seeing which articles cite a particular document.

Verdict: Google Scholar > Windows Live Academic (for the moment at least)
Like Google Scholar, Windows Live Academic allows researchers to search the contents of academic journals to find abstracts and, in some cases, full text articles from the publishers' sites. It also features a split-screen for previewing the contents of a particular result.
However, unlike Google Scholar, Windows Live Academic doesn't yet have a feature for seeing which articles cite a particular document.

Verdict: Google Scholar > Windows Live Academic (for the moment at least)