I want to give impersonation right to one of my exchange 2007 user. I have used this command for the same: Get-ExchangeServer | where {$_.IsClientAccessServer -eq $TRUE} | ForEach-Object {Add-ADPermission -Identity $_.distinguishedname -User (Get-User -Identity User1 | select-object).identity -extendedRight ms-Exch-EPI-Impersonation} Topology I am following is: I have one AD and DNS on one machine(Windows Server 2008 SP2),one CAS on second server, Mailbox Server and other roles on third different machine. I get error " HTTP request failed with error: Bad response from server, HTTP code returned: 500, HTTP status code" when I try to access mailbox of users on Exchange by making EWS calls. When I checked the Wireshark traces on Exchange CAS server it shows error "Impersonation failed" What should I do now..?

Hi, You also need to configure impersonation for the mailbox databases. Get-MailboxDatabase | ForEach-Object {Add-ADPermission -Identity $_.DistinguishedName -User USER1 -ExtendedRights ms-Exch-EPI-May-Impersonate} Martina Miskovic - http://www.nic2012.com/

Thanks Martina for your kind response. I have fired the above command and configured the impersonation for mailbox database, the command was executed successfully but I am still getting the same error "Impersonation failed" in Wireshark traces at CAS. What else can I do more ?

Hi avinashbhucs, I would suggest you seek the solution in the Development Forum: http://social.technet.microsoft.com/Forums/en-US/exchangesvrdevelopment/threads Similar post: Impersonation (again) http://social.technet.microsoft.com/forums/en-US/exchangesvrdevelopment/thread/cf119d33-d8a8-4941-a4a5-11ecf7d3b3ee/ Resource: Configuring Exchange Impersonation (Exchange Web Services) http://msdn.microsoft.com/en-us/library/bb204095(v=exchg.80).aspx Frank Wang

Hi Frank, Thanks for your assistance. I have gone through the links suggested by you and i tried the options which were present in the link but no luck. Still i am facing the same issue. Is any thing else that you can suggest to resolve it out. Avinash

Hi Avinash, I would still suggest you seek the solution in the Development forum: http://social.technet.microsoft.com/Forums/en-US/exchangesvrdevelopment/threads Please also provide the code you used in the thread. Frank Wang