Skip to main content

Exporting and Uploading Mailbox Items using Exchange Web Services using the new ExportItems and UploadItems operations in Exchange 2010 SP1

Two new EWS Operations ExportItems and UploadItems where introduced in Exchange 2010 SP1 that allowed you to do a number of useful things that where previously not possible using Exchange Web Services. Any object that Exchange stores is basically a collection of properties for example a message object is a collection of Message properties, Recipient properties and Attachment properties with a few meta properties that describe the underlying storage thrown in. Normally when using EWS you can access these properties in a number of a ways eg one example is using the strongly type objects such as emailmessage that presents the underlying properties in an intuitive way that's easy to use. Another way is using Extended Properties to access the underlying properties directly. However previously in EWS there was no method to access every property of a message hence there is no way to export or import an item and maintain full fidelity of every property on that item (you could export the item as an EML but this doesn't provide any fidelity of the properties on item).

Now with these two new operations there is a method of exporting and uploading items and maintaining all the Mapi properties. The only real restriction is by default the maximum import payload is 25MB of base64 encoded data but these setting can be modified in the web.config file. The export/import format that these two operations use in a stream format which is a stream of all the Exchange properties separated with meta properties to represent the different property collections on the Item. This format while it bares some similarity to TNEF and Compound Message format (MSG) is not the same.

There are no methods in the EWS Managed API to use these operations so you need to use EWS Proxy code or just raw SOAP when writing applications or script to use this. However you do need the EWSid's of the Items and Folder to upload or export items and the Managed API is the easiest way of getting these. For this post I've create a sample of exporting the last received item in the Inbox first using the EWS Managed API to find the last item and then use raw SOAP to export the items.

I posted a downloadable copy of the following EWS Managed API script here the code itself looks like

$MailboxName = ""
$fileName = 'c:\exp.fts'
$cred = New-Object System.Net.NetworkCredential("","password")

$dllpath = "C:\Program Files\Microsoft\Exchange\Web Services\1.1\Microsoft.Exchange.WebServices.dll"
$service = New-Object Microsoft.Exchange.WebServices.Data.ExchangeService([Microsoft.Exchange.WebServices.Data.ExchangeVersion]::Exchange2010_SP1)
$service.TraceEnabled = $false

$windowsIdentity = [System.Security.Principal.WindowsIdentity]::GetCurrent()
$sidbind = "LDAP://<SID=" + $windowsIdentity.user.Value.ToString() + ">"
$aceuser = [ADSI]$sidbind
$service.Credentials = $cred

$folderid = new-object Microsoft.Exchange.WebServices.Data.FolderId([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::Inbox,$MailboxName)

$view = New-Object Microsoft.Exchange.WebServices.Data.ItemView(1)
$findResults = $service.FindItems($folderid,$view)
$itemid = $findResults.Items[0].Id.Uniqueid

$expRequest = @"
<?xml version="1.0" encoding="utf-8" ?>
<soap:Envelope xmlns:xsi=""
<t:RequestServerVersion Version="Exchange2010_SP1" />
<t:ItemId Id="$itemId"/>
$mbMailboxFolderURI = New-Object System.Uri($service.url)
$wrWebRequest = [System.Net.WebRequest]::Create($mbMailboxFolderURI)
$wrWebRequest.KeepAlive = $false;
$wrWebRequest.Headers.Set("Pragma", "no-cache");
$wrWebRequest.Headers.Set("Translate", "f");
$wrWebRequest.Headers.Set("Depth", "0");
$wrWebRequest.ContentType = "text/xml";
$wrWebRequest.ContentLength = $expRequest.Length;
$wrWebRequest.Timeout = 60000;
$wrWebRequest.Method = "POST";
$wrWebRequest.Credentials = $cred
$bqByteQuery = [System.Text.Encoding]::ASCII.GetBytes($expRequest);
$wrWebRequest.ContentLength = $bqByteQuery.Length;
$rsRequestStream = $wrWebRequest.GetRequestStream();
$rsRequestStream.Write($bqByteQuery, 0, $bqByteQuery.Length);
$wrWebResponse = $wrWebRequest.GetResponse();
$rsResponseStream = $wrWebResponse.GetResponseStream()
$sr = new-object System.IO.StreamReader($rsResponseStream);
$rdResponseDocument = New-Object System.Xml.XmlDocument
$Datanodes = @($rdResponseDocument.getElementsByTagName("m:Data"))
if ($Datanodes.length -ne 0){
$Data = [System.Convert]::FromBase64String($Datanodes[0].'#text')
$fsFileStream = new-object $fileName, ([io.filemode]::create), ([io.fileaccess]::write), ([io.fileshare]::none)
$fsFileStream.Write($Data, 0, $Data.Length);

Popular posts from this blog

Export calendar Items to a CSV file using EWS and Powershell

Somebody asked about this last week and while I have a lot of EWS scripts that do access the Calendar I didn't have a simple example that just exported a list of the Calendar events with relevant information to a CSV file so here it is. I've talked on this one before in this howto  but when you query the calendar folder using EWS you need to use a CalendarView which will expand any recurring appointments in a calendar. There are some limits when you use a calendarview in that you can only return a maximum of 2 years of appointments at a time and paging will limit the max number of items to 1000 per call. So if you have a calendar with a very large number of appointments you need to break your query into small date time blocks. In this example script I'm just grabbing the next 7 days of appointments if you want to query a longer period you need to adjust the following lines (keeping in mind what I just mentioned) #Define Date to Query $StartDate = (Get-Date) $EndDate

Downloading a shared file from Onedrive for business using Powershell

I thought I'd quickly share this script I came up with to download a file that was shared using One Drive for Business (which is SharePoint under the covers) with Powershell. The following script takes a OneDrive for business URL which would look like This script is pretty simple it uses the SharePoint CSOM (Client side object Model) which it loads in the first line. It uses the URI object to separate the host and relative URL which the CSOM requires and also the SharePointOnlineCredentials object to handle the Office365 SharePoint online authentication. The following script is a function that take the OneDrive URL, Credentials for Office365 and path you want to download the file to and downloads the file. eg to run the script you would use something like ./spdownload.ps1 '

The MailboxConcurrency limit and using Batching in the Microsoft Graph API

If your getting an error such as Application is over its MailboxConcurrency limit while using the Microsoft Graph API this post may help you understand why. Background   The Mailbox  concurrency limit when your using the Graph API is 4 as per . This is evaluated for each app ID and mailbox combination so this means you can have different apps running under the same credentials and the poor behavior of one won't cause the other to be throttled. If you compared that to EWS you could have up to 27 concurrent connections but they are shared across all apps on a first come first served basis. Batching Batching in the Graph API is a way of combining multiple requests into a single HTTP request. Batching in the Exchange Mail API's EWS and MAPI has been around for a long time and its common, for email Apps to process large numbers of smaller items for a variety of reasons.  Batching in the Graph is limited to a m
All sample scripts and source code is provided by for illustrative purposes only. All examples are untested in different environments and therefore, I cannot guarantee or imply reliability, serviceability, or function of these programs.

All code contained herein is provided to you "AS IS" without any warranties of any kind. The implied warranties of non-infringement, merchantability and fitness for a particular purpose are expressly disclaimed.