Microsoft released update rollup 10 on 8th April 2010 for Microsoft Dynamics CRM 4.0 (KB 979347).


You can download it at the following location,

http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=5da4d352-1d3f-4426-9c17-b256c30afdb9

The KB article contains the installation instructions and list of fixes.

http://support.microsoft.com/?kbid=979347