IBM Lotus Notes integration with SAP CRM

Hello,

Pls. advise if SAP CRM activity and workflow could be integrated with IBM Lotus Notes. As I understand that both SAP and IBM says it is possible. I need to know how powerful the interaction is with Lotus Notes calendar and not only e-mails. If you were involved in the actual interaction implementation, any challenges that you have faced.

Thanks for the answer. I'll reward you with points as well.