Looking deeper into a recent report on findability:

Surprisingly, survey respondents report that "multiple search engines are the norm in most organizations". To put a finer point on it: "There is a separate search solution for e-mail, Web content, wikis, Blogs, ERP systems, CRM systems, intranets, File shares, and so on." Less surprising is that this irritates users.

Just because you can do a Google search and get some relevant data, doesn't mean a Web-based search engine is right for your organization's needs. Unlike Web search, you don't want to find the most popular result; you want to find the right result. And users expect to get better answers because they are far more familiar with the enterprise’s content. They want to be able to explore the content by navigating through results instead of entering more queries.