How to do deep traversals with FindItem queries - exchangewebservices

Question

I am sending the following XML query to EWS using the Office.context.mailbox.makeEwsRequestAsync method. It works as long as Traversal is set to "Shallow". I get a "The request is invalid" error when I set Traversal to "Deep".
How do I recursively search subfolders if I can't do deep searches?
<?xml version="1.0" encoding="utf-8"?>
<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" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Header>
<t:RequestServerVersion Version="Exchange2013_SP1" />
</soap:Header>
<soap:Body>
<m:FindItem Traversal="Shallow">
<m:ItemShape>
<t:BaseShape>AllProperties</t:BaseShape>
</m:ItemShape>
<m:IndexedPageItemView MaxEntriesReturned="10" Offset="0" BasePoint="Beginning" />
<m:Restriction>
<t:Contains ContainmentMode="FullString" ContainmentComparison="IgnoreCase">
<t:FieldURI FieldURI="item:Categories" />
<t:Constant Value="MyCategory" />
</t:Contains>
</m:Restriction>
<m:ParentFolderIds>
<t:DistinguishedFolderId Id="inbox" />
<t:DistinguishedFolderId Id="sentitems" />
</m:ParentFolderIds>
</m:FindItem>
</soap:Body>
</soap:Envelope>

Answer 1

The FindItem EWS call does not support Traversal="Deep". See FindItem.
This is because the call will search for items in the folders specified in ParentFolderIds. In order to do a recursive search, you will need to get the list of folders to include in the search by using the FindFolder EWS Operation which supports Traversal="Deep" on non public folders. See FindFolder for additional documentation.