For ExchangeServiceBinding::UpdateItem in Exchange 2007, the following error message appears:
When creating a request as an account that does not have a mailbox, you must specify the primary SMTP address of the mailbox for any identifiers of the selected folder.
When I missed ExchangeServiceBinding::UpdateItem in the code and applied only ExchangeServiceBinding::SendItem received the following error message:
The user account that was used to send this request is not allowed to send mail on behalf of the specified sending account
Created a mailbox for the user credentials, but this does not help.
Any help?
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