Solution : https://service.sap.com/sap/support/notes/618028 (SAP Service marketplace login required)
Key words :
'download signed activex controls' -> 'prompt' 'run activex controls, 'activex controls, tab page 'advanced', save encrypted pages, plug-ins' -> 'enabled', marketing calender iview, marketing calendar iview, ms internet explorer, terms activex, activex control
Related Notes :
| 634869 | SAPKU40001: Support Package 01 for CRM 4.0 |