For all of my Microsoft Dynamics CRM friends that have an on-premise deployment, Update Rollup 16 for Microsoft Dynamics CRM 2011 is available. Keep in mind the release cycles and that UR’s are updates and hotfixes only. There is no new functionality in this release. No new features should not stop you frm deploying this release as there are quite a few fixes and performance improvements.
The link below provides all the details.