You may have noticed that the Update Rollup 10 build number was incremented on the Microsoft Download Center page for Microsoft Dynamics CRM 2011 Update Rollup 10. This is because the Update Rollup 10 packages were re-released on 10/4/2012. The original build number of Update Rollup 10 was 5.0.9690.2730. The build number of the re-release is 05.00.9690.2740. The new packages include "v2" in the title, i.e. CRM2011-Server-KB2710577-v2-ENU-amd64.exe, etc.
General guidance regarding this re-release:
Fixes released in the Update Rollup 10 re-release are few, and include:
Microsoft Premier Field Engineering