So just had a mail from Anne Wallace a friend who works over in Redmond and is an absolute mine of information. She was highlighting this whitepaper which could be very interesting if you have customers with offices in many countries:

http://technet2.microsoft.com/Office/en-us/library/87065c9d-d39d-479d-909b-02160ec6d7791033.mspx

Check it out another great techNet paper!