_cparker , following is a sample EWS Request made from the code:
<?xml version='1.0' encoding='utf-8'?>
<soap:Envelope
xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages"
xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types">
<soap:Header>
<t:RequestServerVersion Version="Exchange2010_SP2"/>
<t:ExchangeImpersonation>
<t:ConnectingSID>
<t:SmtpAddress>user1@xxxx</t:SmtpAddress>
</t:ConnectingSID>
</t:ExchangeImpersonation>
</soap:Header>
<soap:Body>
<m:CopyItem>
<m:ToFolderId>
<t:FolderId Id=“aaaaaaaaaaaa”/>
</m:ToFolderId>
<m:ItemIds>
<t:ItemId Id=“bbbbbbbbbb” ChangeKey=“ccccccccc”/>
</m:ItemIds>
</m:CopyItem>
</soap:Body>
</soap:Envelope>
Here, we are trying to copy the itemid "bbbbbbbbbb" from mailto:user1@xxxx, to the folder Id "aaaaaaaaaaaa" that belongs to a different mailbox.
Can you please confirm-
1) This EWS request will not be affected? as it is using "ExchangeImpersonation"