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FIX: You receive a "The page cannot be found" error message when you click the URLs of certain items that are returned in the search results in SharePoint Portal Server 2003
http://support.microsoft.com/kb/835708

SYMPTOMS
If you configure Microsoft Office SharePoint Portal Server 2003 to crawl and index the public folder store of a computer that is running Microsoft Exchange Server 2003, you may not be able to access certain items that are returned in the search results after you search for content in the public folder store. When you click a URL that is listed in the search results, you receive the following error message:
The page cannot be found.

HTTP 400 - Bad Request
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CAUSE
This problem may occur if Microsoft Outlook Web Access (OWA) items that contain one or more angle brackets (< or &gt in the subject line are returned in the search results. SharePoint Portal Server 2003 incorrectly encodes the < and > characters that are contained in the URLs of OWA items that are returned in the search results.
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RESOLUTION
This problem was first fixed in a hotfix that is now contained in a service pack. If you installed the latest SharePoint Portal Server 2003 service pack, you do not have to install the hotfix.
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Service pack information
This problem is corrected in SharePoint Portal Server 2003 Service Pack 1.

To resolve this problem, obtain the latest service pack for Microsoft SharePoint Portal Server 2003. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
889380 (http://support.microsoft.com/kb/889380/) How to obtain the latest service pack for SharePoint Portal Server 2003
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Hotfix information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next SharePoint Portal Server 2003 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=support (http://support.microsoft.com/contactus/?ws=support)
Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.
The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel. Date Time Version Size File name
----------------------------------------------------------------------------
30-Jan-2004 04:20 11.0.5716.1 4,602,616 Microsoft.SharePoint.Portal.dll

Note This update requires SharePoint Portal Server 2003. You may have to restart your computer after you apply this update.
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STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article.
This problem was first corrected in SharePoint Portal Server 2003 Service Pack 1.