Exchange 2010 Force Plain Text

I'm in an environment where all incoming and outgoing email (messages sent within exchange exempt) need to be forced into plain text. I'd like to do this at the Exchange level if possible. Client side is a mix up of iphone/pad and OWA and ~3 Outlook 2007 clients using OutlookAnywhere so a client side fix would be hard to enforce.

I've looked at Transport rules, but do not see any Transport Rule Actions that seem to be relevant.  Perhaps there is something I do not know.

Google is not proving too helpful, or maybe I am searching for the wrong things. Perhaps a 3rd party application?
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John-Charles-HerzbergConnect With a Mentor Commented:
It would be Message Encoding Options.
Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Configure your message format for remote domains.
JantirAuthor Commented:
This worked great for outgoing email.  Any tips on how I can get incoming email do do this as well?
JantirAuthor Commented:
This solves 1 part of the question but not the second (and more important) part.
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