Download Security Update for Excel Services for Microsoft Office SharePoint Server 2007 (KB979439), 32-bit Edition from Official Microsoft Download Center

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Security Update for Excel Services for Microsoft Office SharePoint Server 2007 (KB979439), 32-bit Edition

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A security vulnerability exists in Excel Services in Microsoft Office SharePoint Server 2007 that could allow arbitrary code to run when a maliciously modified file is opened on the server. This update resolves that vulnerability.