You can download the latest rollup for MS CRM 4.0 here: http://www.microsoft.com/downloads/details.aspx?FamilyID=0DDF8E83-5D9C-4FE7-9AE6-F2713A024071&displaylang=en seems like yesterday that rollup 1 was released... ;)

 

Notes about exporting and importing customisations

 

You can export customisations from a server that has Update Rollup 2 or Update Rollup 3 for Microsoft Dynamics CRM 4.0 installed and import those customisations to a server that has Update Rollup 4 for Microsoft Dynamics CRM 4.0 installed. You can also export customizations from a server that has Update Rollup 4 for Microsoft Dynamics CRM 4.0 installed and import those customizations to a server that has Update Rollup 2 or Update Rollup 3 for Microsoft Dynamics CRM 4.0 installed.


If you export customisations from a server that is running Microsoft Dynamics CRM 4.0 server, do not import the customisations to the Microsoft Dynamics CRM 4.0 server in the following scenarios:

• The server from which you are exporting the customisations has no updates installed or has Update Rollup 1 for Microsoft Dynamics CRM 4.0 installed. However, the server to which you are importing the customisations has Update Rollup 4 for Microsoft Dynamics CRM 4.0 installed
• The server from which you are exporting the customisations has Update Rollup 4 for Microsoft Dynamics CRM 4.0 installed. However, the server to which you are importing the customisations has no updates installed or has Update Rollup 1 for Microsoft Dynamics CRM 4.0 installed.

Its a welcome site to see SP1 for MS CRM being released. You can download it here http://www.microsoft.com/downloads/details.aspx?familyid=57c6267b-3b13-49dd-bfed-3cc83633aea7&displaylang=en&tm it contains a roll up of the following hot fixes http://support.microsoft.com/default.aspx/kb/949256