Binding an Item from an archive mailbox using impersonation

Hello,

i try to bind an Item with EWS Managed API from an archive mailbox without success.

I have the following things:

SMTP Address of the Primary mailbox

The EntryId of the Item (I used ConvertId on Primary Mailbox )

But binding the item always fails...

The service is configured for Exchange 2010 SP2.
What am i doing wrong?

I tried Access with WellKnownFoldernames of Archive, too. But FindItems does not accept Complex Properties as ItemIds...

Any idea?

Regards

Thorsten

Best Regards/Viele Grüße Thorsten