To check version numbers on certain files and registry keys
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You can examine the version number of specific files in %COMMONPROGRAMFILES%\Microsoft Shared\Web server extensions\12\ISAPI.
Check the Microsoft.SharePoint.portal.dll version number for the update that you installed against the Office SharePoint Server 2007 Microsoft.SharePoint.portal.dll version numbers that are provided in the "Major Updates for Office SharePoint Server 2007" table.
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In Registry Editor, verify that the value is correct in the DisplayVersion key in the following locations:
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For x86: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ Windows\CurrentVersion\Uninstall\OSERVER
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For x64: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\ Windows\CurrentVersion\Uninstall\OSERVER
Check the Microsoft.SharePoint.portal.dll version number for the update that you installed against the Office SharePoint Server 2007 Microsoft.SharePoint.portal.dll version numbers that are provided in the "Major Updates for Office SharePoint Server 2007" table.
Check the URL below for matching version numbers to particular Service packs and CU's.
http://technet.microsoft.com/en-us/library/cc263467(office.12).aspx