Microsoft has released Update Rollup 21 for Microsoft Dynamics CRM 4.0
Microsoft has released Update Rollup 21 for Microsoft Dynamics CRM 4.0 Server, Microsoft Dynamics CRM for Microsoft Office Outlook, Microsoft Dynamics CRM Data Migration Manager, Microsoft Dynamics CRM 4.0 Language Packs, and Microsoft Dynamics CRM 4.0 E-mail Router.Update Rollup 21 for Microsoft Dynamics CRM 4.0 (KB 2621054)
For more information about this release, see Microsoft Knowledge Base article 2621054:
Update Rollup 21 is available for Microsoft Dynamics CRM 4.0
To maintain parity between the application components of Microsoft Dynamics CRM 4.0, this update rollup includes packages for Microsoft Dynamics CRM 4.0 Server, Microsoft Dynamics CRM for Outlook, Microsoft Dynamics CRM Data Migration Manager, Microsoft Dynamics CRM Language Packs, and Microsoft Dynamics CRM 4.0 E-mail Router.