You have to enable AutomateProcessing for each mailbox where EWS is used on the BES.
As EWS seems to be default for 5.0.2 this leads to issues as BES does not fallback to CDO in this case.
Solution 1: Use a static mailagent with CDO for these users
Solution 2: Enable AutomateProcessing
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BES 4.1.7 (20 servers), Domino 7.0.3 with 19000+ users
BES 5.0.2 (8 server), Exchange 2010 SP1 with 1000+ users
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