The index requires almost no maintenance. However, if the index can't find a file that you know exists in an indexed location, you might need to rebuild the index.
Rebuilding the index can take several hours, and searches might be incomplete until the index is fully rebuilt.
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Open Indexing Options by clicking the Start button
, and then clicking Control Panel. In the search box, type indexing options, and then click Indexing Options.
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Click Advanced.
If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
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In the Advanced Options dialog box, click the Index Settings tab, and then click Rebuild.
