Article ID: 314162 - View products that this article applies to.
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When you perform a search by using SharePoint Portal Server Service Pack 1 (SP1), simple searches may return an excessive amount of results that include many different file types.
This problem can occur because SharePoint Portal Server SP1 installs a Portal.backup folder in the Portal folder. The folder is indexed by default and has Everyone read permissions.
To work around this problem:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.