Update Rollup 1 is now available for CRM 4

Microsoft has released Update Rollup 1 for Microsoft Dynamics CRM 4.0 Server, Microsoft Dynamics CRM for Microsoft Office Outlook, and Microsoft Dynamics CRM 4.0 E-mail Router.
For more information about this release, see Microsoft Knowledge Base article 952858.

http://support.microsoft.com/default.aspx?kbid=952858

To download the update, click here.