Google Search Appliance User Experience Guide - Manual (Page 13)

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collection that contains only profile information. Data sources for this collection
can include Microsoft SharePoint, LDAP, or any other profile content with
metadata that can be crawled or fed into the search index.
From version 7.0, Expert Search replaces People Search.
Google Apps results
(sidebar element)
Google Apps provide your organization with tools for collaborating on
documents, spreadsheets, presentations, sites, and more. You can configure
the search appliance to federate search results from Google Apps. The
integrating personal content feature shows private and public content that a
user has permission to view directly from your Google Apps domain.
Google Site Search
results
(sidebar element)
Google Site Search is a hosted search solution for publicly available content.
You can configure search across your external website, your partner sites, or
other sites that are relevant to your organization. You can enable the search
appliance to serve results from Google Site Search in the sidebar element on
the search results page by specifying your custom search engine identifier.