Feature

SharePoint Foundation 2010

Search Server 2010 Express

Search Server 2010

SharePoint Server 2010

FAST Search Server 2010 for SharePoint

Basic search

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Visual Best Bets
Keyword terms and synonyms defined by an administrator to enhance search results. For FAST Search Server 2010 for SharePoint only, a section of relevant information is displayed in addition to search results for a keyword term (for example, an image banner or HTML).

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Scopes
Users can filter search results by using scopes.

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Search enhancements based on user context
Scopes Best Bets, visual Best Bets, and document promotions and demotions to a sub-group of employees.

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Custom properties
Manage which properties are indexed and how these are treated in search results.

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Property extraction
Extracts key information (people names, locations, company names) from unstructured text to use as additional managed properties. (Limited: title, author, and date only.) 

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Query federation
Federates results from multiple search sources.

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Query suggestions
Provides help with query formulation based on what the user types.

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Similar results
Generates a new search based on the selected search result.

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Sort results on managed properties or rank profiles
Sort results based on selected managed properties or by FAST Query Language (FQL) formula.

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Relevancy tuning by document or site promotions
Promote selected documents or sites as highly relevant results for a keyword. Demote documents or sites to give lower rank. (Limited: promote documents for a given site, not query specific.)

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Shallow results refinement
Refine results using metadata associated with the top results.

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Deep results refinement
Refine results using metadata associated with all results.

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Previewers
Display inline previews of Word, PowerPoint, and Excel files.

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Windows 7 federation
Enterprise search results are available in Windows desktop search.

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People search
Search users to find people by name or expertise.

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Social search
Relevancy is improved by how people interact and relate with content by factoring in social tagging and the relationship of people to content and other people.

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Taxonomy integration
Takes advantage of user generated tags. Managed taxonomy influences search rankings and experience.

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Multi-tenant hosting
Data partitioning of crawled data based on tenants.

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Rich Web indexing support
Indexing of wide variety of Web content, including Flash.

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