If you want to let users search forum posts for some given text, you can use the Forum search (ForumSearch.ascx) and Forum search results (ForumSearchResults.ascx) web parts. You will typically place them both on the same page. However, if you need to place the forum search box on a different page, you can set its Redirect to URL property to the page where you have the Forum search results web part, such as ~/SearchForum.aspx. These web parts use the SQL search engine.

 

 

If you prefer index-based searching, this can be provided by various Smart search web parts from the Full-text search category if they have a forums type search index set. Please refer to the Modules -> Smart search chapter for more details.

 

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