The Search Center is a new type of site that is included by default in the site collection when you provision a collaboration portal. Its goal is to provide users with a customized search experience, and to replace the search box that is available at the top of the pages in the portal. There are two editions of the Search Center: the Search Center Lite and the Search Center with Tabs. The Search Center Lite is typically added to site collections where the publishing features are not activated. An example is a site collection with only team sites. The Search Center with Tabs offers a full customization using a tab-based user interface, but it requires the publishing features to be active. This is the case by default within collaboration portals. This article covers two customization options that can be performed in the Search Center with Tabs: how to add custom search pages and tabs, and, how to replace the XSLT for the search results with a custom XSLT.