I'm just curious if anyone is using, or found a way to use, the Microsoft.MetadirectoryServices.IMACalloutExtension interface that's present in Microsoft.MetadirectoryServicesEx.dll, and which the built-in AD MA seems to use for Exchange provisioning. It doesn't appear to affect an MA's operation by its presence alone...
Steve Kradel, Zetetic LLC SMS OTP for FIM | Salesforce MA for FIM