Microsoft has posted CRM v2011 Update Rollup 15.

Do you have a lot of other OutLook Integrations? CRM Outlook Client causing you grief on just one machine? 

This  rollup includes “process isolation” to split the Outlook Client out from the core Outlook process, an upgrade to SQL CE 4.0, and reductions in isolated performance issues with a large address books (among other things, it’s all in the KB)