Internal Server Error in CreateItem operation of EWS - c++

Question

I'm using CreateItem Operation to save message in the Draft folder using EWS with gSOAP toolkit, but when i run the code I've response XML as follows:
<?xml version="1.0" encoding="utf-8"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Header>
<Action s:mustUnderstand="1" xmlns="http://schemas.microsoft.com/ws/2005/05/addressing/none">*</Action>
</s:Header>
<s:Body>
<s:Fault>
<faultcode xmlns:a="http://schemas.microsoft.com/exchange/services/2006/types">a:ErrorInternalServerError</faultcode>
<faultstring xml:lang="en-US">An internal server error occurred. The operation failed.</faultstring>
<detail>
<e:ResponseCode xmlns:e="http://schemas.microsoft.com/exchange/services/2006/errors">ErrorInternalServerError</e:ResponseCode>
<e:Message xmlns:e="http://schemas.microsoft.com/exchange/services/2006/errors">An internal server error occurred. The operation failed.</e:Message>
</detail>
</s:Fault>
</s:Body>
</s:Envelope>
and in the terminal the fault which i've got is:
SOAP 1.1 fault: SOAP-ENV:MustUnderstand[no subcode]
"The data in element 'Action' must be understood but cannot be processed"
Detail: [no detail]
and there is no compile time error. If you need code, kindly let me know, I'll give that also. Please help me, I've tried a lot, but not find the solution, no matter I change in code, the response XML remains same.
Request XML is as follows:
<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:ns1="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:ews="http://schemas.microsoft.com/exchange/services/2006/messages">
<SOAP-ENV:Body>
<ews:CreateItem xsi:type="ews:CreateItemType" MessageDisposition="SaveOnly"><ews:SavedItemFolderId xsi:type="ns1:TargetFolderIdType">
<ns1:DistinguishedFolderId Id="drafts" xsi:type="ns1:DistinguishedFolderIdType"></ns1:DistinguishedFolderId>
</ews:SavedItemFolderId>
<ews:Items xsi:type="ns1:NonEmptyArrayOfAllItemsType">
<ns1:Message xsi:type="ns1:MessageType">
<ns1:ItemClass xsi:type="ns1:ItemClassType">IPM.Note</ns1:ItemClass>
<ns1:Subject xsi:type="xsd:string">Project Action</ns1:Subject>
<ns1:Body BodyType="Text" xsi:type="ns1:BodyType">Priority - Update specification</ns1:Body>
<ns1:Sender xsi:type="ns1:SingleRecipientType">
<ns1:Mailbox xsi:type="ns1:EmailAddressType">
<ns1:EmailAddress xsi:type="ns1:NonEmptyStringType">markzuck93#live.com</ns1:EmailAddress>
</ns1:Mailbox>
</ns1:Sender>
<ns1:ToRecipients xsi:type="ns1:ArrayOfRecipientsType">
<ns1:Mailbox xsi:type="ns1:EmailAddressType">
<ns1:EmailAddress xsi:type="ns1:NonEmptyStringType">openuib#openuib.onmicrosoft.com</ns1:EmailAddress>
</ns1:Mailbox>
</ns1:ToRecipients>
</ns1:Message>
</ews:Items>
</ews:CreateItem>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>

Answer 1

I would suggest you get rid of all the xsi:type attributes eg how to remove xsi:type information from gSoap message?
Simplified your request should look like
<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:ns1="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:ews="http://schemas.microsoft.com/exchange/services/2006/messages">
<SOAP-ENV:Body>
<ews:CreateItem MessageDisposition="SaveOnly">
<ews:SavedItemFolderId>
<ns1:DistinguishedFolderId Id="drafts" />
</ews:SavedItemFolderId>
<ews:Items>
<ns1:Message>
<ns1:ItemClass>IPM.Note</ns1:ItemClass>
<ns1:Subject>Project Action</ns1:Subject>
</ns1:Message>
</ews:Items>
</ews:CreateItem>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
Which works okay for me.
cheers
Glen

Answer 2

I recently explored the EWS api and found that a Sender tag causes the 500 response with the CreateItem request. Rather, you should be using the From tag.
<ns1:From xsi:type="ns1:SingleRecipientType">
<ns1:Mailbox xsi:type="ns1:EmailAddressType">
<ns1:EmailAddress xsi:type="ns1:NonEmptyStringType">markzuck93#live.com</ns1:EmailAddress>
</ns1:Mailbox>
</ns1:From>