I have just upgraded our Microsoft Dynamics CRM Installation from 3.0 to 4.0. I postponed (the release was around December 2007) that because of errors in the setup package. I was very happy that those issues are fixed now.
If you have problems Viewing CHM Files Across The Network.
Microsoft Security Update 896358
Microsoft recently released a security patch that makes it impossible to view CHM files that are stored on a network drive (as opposed to CHM files stored on your own computer). The help file will appear, but instead of the topic text you will see an error message “this page cannot be displayed”.