Two posts back I did a very brief preamble on setting up Information Rights Management for Exchange 2010 SP1. (Ok, I basically pointed you in the general direction of the TechNet documentation.) Let’s take a couple of further looks, going slightly into more detail on the matter. I assume that an IRM infrastructure is already in place, and that you’ve run the Test-IRMConfiguration cmdlet on Exchange with a passing result. If you’ve already have all that in place lets move on.
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I do a quick tour of sending an IRM-protected mail through Outlook Web Access, and show what it looks like on a non-compliant ActiveSync client before explaining the short theory behind having it available in Exchange ActiveSync.

