Several customers are reporting issues since installing rollup 5 which is not uninstallable:
- Workflow based Organizations (many levels deep)
- ADFS / IFD Deployments
- CRM Email Router and Outlook Clients ( Cannot access the webservices)
A hotfix was originally released but now has been disgarded. Micorosft has now released UR6 to fix some of the issue(s) introduced with UR 5.