How to receive/execute workflow workitems in MS outlook

Hi,

I was told that it is possible to receive/execute workflow workitems in MS outlook or other supported mail clients (not SAP INBOX). I have tried to research (SDN, OSS) and so far just found documentations to set up workflow notification to MS outlook. Nothing about receive/execute workflow workitems. I'd like to be able to set this up without buying a third-party vendor product. I would really appreciate it if someone could give me some guidance on where to find some helpful documentations or some brief description how to configure this.

Thank you.

Jennifer