An article has been published on the TechNet wiki by Henrik Walther about “Exchange ActiveSync Considerations When Using Windows Phone 7 Clients”.
There was a previously article “Exchange ActiveSync comparison table”, which listed all the EAS features of the different phones.
This new article goes through EAS features and Windows Phone 7, since it is important to note that Windows Phone 7 devices only support a subset of the Exchange ActiveSync (EAS) policies available with Exchange 2003 SP2, Exchange 2007, and Exchange 2010.
Read the full wiki article: “Exchange ActiveSync Considerations When Using Windows Phone 7 Clients”.