Microsoft SharePoint. Building Office 2007 Solutions in VB 2005 ...

106CHAPTER 4 ■ SHAREPOINT SHARED SERVICESthe account must have access to all of the content to be indexed. If you set up the developmentenvironment in Chapter 2, you should use the DOMAIN\SPCrawlAcct account youcreated during the MOSS installation.After the content access account is set, you’ll want to define the content sources to beindexed. By default, MOSS creates a content source for SharePoint sites. If you only intend tosearch SharePoint content, this source may be all you need. However, you can define othercontent sources including web sites, file shares, Exchange public folders, and business datafrom the BDC.Along with the content source, you can also define crawl rules. Crawl rules allow you tospecify what content is included or excluded from a source. You can also set a special accountto use when crawling the source if the default account does not have access for some reason.If the content you crawl has a different address than you want to appear in the searchresults, you can create a server name mapping. This is useful if, for example, you crawl contentusing an address inside the firewall but want to make the results available outside the firewall.Simply enter the address of the crawled content and the mapped address for the search results.After you have configured the content sources, you need to specify a schedule for thecrawl. You won’t get any results back from the Search Service until a full crawl of the contentsources has been completed. Because a full crawl is resource intensive, you should try toschedule it for off-hours.Follow these steps to set up a crawl schedule:1. From the Configure Search settings page, click Content Sources and Crawl Schedules.2. On the Manage Content Sources page, hover over the Local Office SharePoint ServerSites content source and select Edit from the drop-down menu.3. On the Edit Content Source page, click the Create Schedule under the Full CrawlSchedule list.4. In the Manage Schedules dialog, accept the default settings by simply clicking the OKbutton.5. Check the box labeled Start Full Crawl of This Content Source.6. Click the OK button.Including File TypesWhen the Search Service creates a content index, it does not include all of the file types itencounters. This is because many file types might not make any sense in the search results.For example, EXE files are not included in the content index because they are not documentsand might even contain a virus. While the out-of-the-box settings index most of the commonlyused file types, not every file type you may want is included. In particular, most organizationswant to include Adobe Acrobat portable document format (PDF) files in the searchresults, but they are not included by default.In order to include other file types, you must first install the appropriate IFilter. IFiltersare used to build indexes for specific document formats. Each file type that you want toinclude must have an installed IFilter before it can be part of the index. After you install theIFilter, you must then provide an image to represent the file within SharePoint and specificallytell the index to include the file type.