Microsoft released update rollup 13 on 23rd September 2010 for Microsoft Dynamics CRM 4.0 (KB 2267499).
You can download it at the following location,
http://www.microsoft.com/downloads/details.aspx?FamilyID=406E6247-873B-4DB0-8A25-3F041B066844&displaylang=ar&displaylang=en
The KB article contains the installation instructions and list of fixes.
http://support.microsoft.com/?kbid=2267499
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