IDA article o' the week - Comparing and Contrasting AD RMS and S/MIME

I thought this article was a helpful discussion of the two technologies, particularly how their feature sets provide support for various information protection scenarios.

...in a few areas, there are overlapping standards that complement each other instead of directly competing. One relevant example is the case of Active Directory Rights Management Services (AD RMS) and Secure Multipurpose Internet Mail Extensions (S/MIME), two security protocols for protecting messages against exploitation.