There are many options you can integrate your MS CRM 4.0 with sharepoint see following addons
http://www.crmxperts.com/Products/SharepointIntegrationforMSCRM/tabid/69/Default.aspx
Regards,
Imran
MVP CRM https://mvp.support.microsoft.com/profile/imran.mustafa
MSN : mscrmexpert@gmail.com
SKYPE : mscrmexpert
BLOG : http://microsoftcrm3.blogspot.com
