There have been some confusion around how to get the MRSProxy service to work properly in a remote Exchange 2010 forest with SSL offloading configured (requires an additional change in the EWS web.config file). So in order to eliminate this confusion, the Exchange 2010 SSL Offloading TechNet Wiki article has now been updated to include a section specifically about SSL Offloading for the MRSProxy service.
The configuration has been reviewed by an Exchange dev as well as an Exchange PM with responsibility for the MRSProxy service.
Technology Architect/Writer/MS Vendor
MCM: Exchange Server | MVP: Exchange Architecture