eM Email Client for Windows support EWS, we just start testing yesterday and we are very happy with this great peace of software.
EWS its a alternative to the expensive active sync, and its available only for outlook 2011 for MAC.
eM Client works great with EWS but its showing an error on email send, can SM take a look to see if its on SM side, or if can do something about.
EWS client for windows can be a great solution for customers, take a look on http://www.emclient.com/
Thanks in advance,