Hi Experts, We are trying to get EWS working for our BES users and we are getting errors that are indicating that we do not have the required permissions <snip> Service::TestAccessToMailbox Soap Exception caught: The server to which the application is connected cannot impersonate the requested user due to insufficient permission. Diagnosis: The BES service account does not have impersonation rights on the CAS server. Please consult the BES installation guide for Exchange Server configuration information. </snip> I was told, I have to setup the impersonation rights on the specific CAS server we are using. Please be aware that the CAS servers are configured for a round robin load balancing, so any powershell command needs to be run for each CAS server. Can you provide me with the powershell commands I must run to setup EWS for Exchange 2007, and any other steps that you might consider important? I am not sure if EWS is only compatible for Exchange 2010, and just want to double check with you guys Thank you in advance

Any updates so far?

Hi, See whether it helps http://calendarservermigration.blogspot.com/2007/08/exchange-2007-impersonation-debugging.htmlRegards from www.windowsadmin.info

Hi Manu, Thanks for the article, Can we safely say that we can setup EWS for Exchange 2007/BES? If so What would be general steps to follow?

Could I please get an acknowledge regarding my questions? Thank you in advance

we finally found the exact procedure http://www.blackberry.com/btsc/search.do?cmd=displayKC&docType=kc&externalId=KB20157 Thank you everyone