How to query EWS for a Calendar Message Body - outlook

Question

I'm looking for a little more details than what was given in this answer: Exchange EWS not returning message body for calendar
Specifically I'm not sure how to get a calendar message's body in a query.
My XML query is:
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Body>
<m:FindItem Traversal="Shallow" xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types">
<m:ItemShape>
<t:BaseShape>IdOnly</t:BaseShape>
<t:AdditionalProperties>
<t:FieldURI FieldURI="item:Body"/>
<t:FieldURI FieldURI="calendar:Start"/>
<t:FieldURI FieldURI="calendar:End"/>
<t:FieldURI FieldURI="calendar:Location"/>
<t:FieldURI FieldURI="item:Attachments"/>
</t:AdditionalProperties>
</m:ItemShape>
<m:CalendarView EndDate="2016-07-08T00:00:00Z" MaxEntriesReturned="999999" StartDate="2016-07-07T00:00:00Z"/>
<m:ParentFolderIds>
<t:DistinguishedFolderId Id="calendar"/>
</m:ParentFolderIds>
</m:FindItem>
</s:Body>
</s:Envelope>
But I seem to be getting an error with:
<t:FieldURI FieldURI="item:Body"/>
Error Message
<?xml version="1.0" encoding="utf-8"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Header>
<h:ServerVersionInfo xmlns:h="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" MajorVersion="15" MinorVersion="1" MajorBuildNumber="534" MinorBuildNumber="21"/>
</s:Header>
<s:Body>
<m:FindItemResponse xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types">
<m:ResponseMessages>
<m:FindItemResponseMessage ResponseClass="Error">
<m:MessageText>Property is not valid for this operation.</m:MessageText>
<m:ResponseCode>ErrorInvalidPropertyForOperation</m:ResponseCode>
<m:DescriptiveLinkKey>0</m:DescriptiveLinkKey>
<m:MessageXml>
<t:FieldURI FieldURI="item:Body"/>
</m:MessageXml>
</m:FindItemResponseMessage>
</m:ResponseMessages>
</m:FindItemResponse>
</s:Body>
</s:Envelope>
I've looked over the API Here:
https://msdn.microsoft.com/en-us/library/office/aa494315(v=exchg.150).aspx
And I think I must be missing something simple. Is there a way using a specific field based query to get a calendar body?
Thanks

Answer 1

The FindItem operation doesn't return the Body, Attendees and other complex/large properties see https://blogs.msdn.microsoft.com/vikas/2007/07/26/ews-why-does-not-finditem-return-all-the-fields-you-expected/ .
So you need to take the ItemId you get from the FindItem Request and then either make a single GetItem Request https://msdn.microsoft.com/en-us/library/office/aa564509(v=exchg.150).aspx or if you need it for multiple Items batch the GetItem Request together for efficiency.