July 30, 2010
Update Rollup 12 for Microsoft Dynamics CRM 4.0
Microsoft has released Update Rollup 12 for Microsoft Dynamics CRM. Update Rollup 12 is a cumulative update including all updates in the previous 11 Update Rollups, as well as many new fixes. As usual, we recommend only installing the Update Rollup if you are having any issues resolved by it.
Keep in mind that if you are updating the Outlook client, Update Rollup 7 is a prerequisite. On the server, you do not have to have any prior updates installed to install UR 12. This update includes some fixes for email tracking, as well as the pesky "disappearing appointment" phenomenon.
From the Knowledge Base article, here is the list of fixes unique to update rollup 12: