Dear All, I am not able to give permission for the user and getting the above error Please let me know which unique value I can metion for '-identity' (It is not taking even GUID of User) Add-ADPermission -Identity "Name" -User AdminUser -extendedRight ms-Exch-EPI-May-Impersonate I am using the above command to give permission Manju

Did you tried giving the DN ? From the help pages in Technet, The Identity parameter specifies the identity of the object that's getting permissions added. You can specify either the distinguished name (DN) of the object or the object's name if it's unique. If the DN or name contains spaces, enclose the name in quotation marks ("). http://technet.microsoft.com/en-us/library/bb124403.aspxShaba

Dear Shabarinath, Great it works!!!!!!!!!!!! Manju

Cool !Shaba