Add attachments by using EWS in Exchange
Learn how to create new items with attachments, or add attachments to existing items by using the EWS Managed API or EWS in Exchange.
You can add file attachments or item attachments to new or existing items by using the EWS Managed API or EWS. If you are using the EWS Managed API, you use the same method to add attachments to new or existing items; however, the method changes if you're using a file or item attachment. Conversely, if you are using EWS, you use the same operation to add either a file or item attachment to an item, but the operation changes if you're adding the attachment to a new or existing item.
Table 1. EWS Managed API methods and EWS operations for adding attachments
| Task | EWS Managed API method | EWS operation |
|---|---|---|
| Add a file attachment to a new or existing email |
AttachmentCollection.AddFileAttachment |
CreateItem for a new email CreateAttachment to add to an existing email |
| Add an item attachment to a new or existing email |
AttachmentCollection.AddItemAttachment |
CreateItem for a new email CreateAttachment to add to an existing email |
Create an email with file and item attachments by using the EWS Managed API
The following code example shows how to create an email with multiple file attachments and an item attachment by:
Using the EmailMessage object to create an email message.
Using the AttachmentCollection.AddFileAttachment and AttachmentCollection.AddItemAttachment methods to add attachments to the message.
Using the EmailMessage.SendAndSaveCopy method to send the message to the recipients and save the message in the Sent Items folder.
This code example shows the four ways in which a file attachment can be added to an item by using the EWS Managed API:
By using a fully qualified file location.
By using a fully qualified file location and a new attachment name.
By using a byte array.
By using a stream.
Note that the item attachment in this example is created at the same time as the email message. To add an existing email message as an item attachment, see Add an existing item to a new email by using the MimeContent and the EWS Managed API.
This example assumes that service is a valid ExchangeService object and that the user has been authenticated to an Exchange server.
public static void CreateEmailWithAttachments(ExchangeService service)
{
// Create an email message and set properties on the message.
EmailMessage message = new EmailMessage(service);
// Set properties on the email message.
message.Subject = "Message with Attachments";
message.Body = "This message contains four file attachments
and one message item attachment.";
message.ToRecipients.Add("sadie@contoso.com");
message.ToRecipients.Add("ronnie@contoso.com");
// Add a file attachment by using the fully qualified location of the file.
message.Attachments.AddFileAttachment("C:\\temp\\FileAttachment.txt");
// Add a file attachment by using the fully qualified string name,
// and specify the name of the attachment as it will appear in the email.
// The new name of the file attachment is SecondAttachment.txt.
message.Attachments.AddFileAttachment("SecondAttachment.txt", "C:\\temp\\FileAttachment2.txt");
// Add a file attachment by using a byte array.
// In this example, theBytes is the byte array that represents the content of the image file to attach.
byte[] theBytes = File.ReadAllBytes("C:\\Temp\\Tulips.jpg");
// The byte array file attachment is named ThirdAttachment.jpg.
message.Attachments.AddFileAttachment("ThirdAttachment.jpg", theBytes);
// Add a file attachment by using a stream.
FileStream theStream = new FileStream("C:\\temp\\FileAttachment4.txt", FileMode.OpenOrCreate);
// The streamed file attachment is named FourthAttachment.txt.
message.Attachments.AddFileAttachment("FourthAttachment.txt", theStream);
// Add an email message as an item attachment and set properties on the item.
ItemAttachment<EmailMessage> itemAttachment = message.Attachments.AddItemAttachment<EmailMessage>();
itemAttachment.Name = "Attached Message Item";
itemAttachment.Item.Subject = "Message Item Subject";
itemAttachment.Item.Body = "Message Item Body";
itemAttachment.Item.ToRecipients.Add("sadie@contoso.com");
itemAttachment.Item.ToRecipients.Add("ronnie@contoso.com");
// Send the mail and save a copy in the Sent Items folder.
// This method results in a CreateItem and SendItem call to EWS.
message.SendAndSaveCopy();
}
Create an email with file and item attachments by using EWS
The following code example shows how to use the CreateItem operation to create an email message with four file attachments and one item attachment. This is also one of the XML requests that the EWS Managed API sends when you create an email with file and item attachments.
Note that the item attachment in this example is created at the same time as the email message. To add an existing email message as an item attachment, see Add an existing item to a new email by using the MimeContent and the EWS Managed API.
<?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="https://schemas.xmlsoap.org/soap/envelope/">
<soap:Header>
<t:RequestServerVersion Version="Exchange2007_SP1" />
</soap:Header>
<soap:Body>
<m:CreateItem MessageDisposition="SaveOnly">
<m:Items>
<t:Message>
<t:Subject>Message with Attachments</t:Subject>
<t:Body BodyType="HTML">This message contains four file attachments
and one message item attachment.</t:Body>
<t:Attachments>
<t:FileAttachment>
<t:Name>FileAttachment.txt</t:Name>
<t:IsInline>false</t:IsInline>
<t:IsContactPhoto>false</t:IsContactPhoto>
<t:Content>VGhpcyBpcyBhIGZpbGUgYXR0YWNobWVudC4=</t:Content>
</t:FileAttachment>
<t:FileAttachment>
<t:Name>SecondAttachment.txt</t:Name>
<t:IsInline>false</t:IsInline>
<t:IsContactPhoto>false</t:IsContactPhoto>
<t:Content>VGhpcyBpcyB0aGUgc2Vjb25kIGZpbGUgYXR0YWNobWVudC4=</t:Content>
</t:FileAttachment>
<t:FileAttachment>
<t:Name>ThirdAttachment.jpg</t:Name>
<t:IsInline>false</t:IsInline>
<t:IsContactPhoto>false</t:IsContactPhoto>
<t:Content>nAoAXNIZMVEZs5GKhdzRcLH/9k=</t:Content>
</t:FileAttachment>
<t:FileAttachment>
<t:Name>FourthAttachment.txt</t:Name>
<t:IsInline>false</t:IsInline>
<t:IsContactPhoto>false</t:IsContactPhoto>
<t:Content>obWVudC4=…</t:Content>
</t:FileAttachment>
<t:ItemAttachment>
<t:Name>Attached Message Item</t:Name>
<t:IsInline>false</t:IsInline>
<t:Message>
<t:Subject>Message Item Subject</t:Subject>
<t:Body BodyType="HTML">Message Item Body</t:Body>
<t:ToRecipients>
<t:Mailbox>
<t:EmailAddress>sadie@contoso.com</t:EmailAddress>
</t:Mailbox>
<t:Mailbox>
<t:EmailAddress>mack@contoso.com</t:EmailAddress>
</t:Mailbox>
</t:ToRecipients>
</t:Message>
</t:ItemAttachment>
</t:Attachments>
<t:ToRecipients>
<t:Mailbox>
<t:EmailAddress>sadie@contoso.com</t:EmailAddress>
</t:Mailbox>
<t:Mailbox>
<t:EmailAddress>ronnie@contoso.com</t:EmailAddress>
</t:Mailbox>
</t:ToRecipients>
</t:Message>
</m:Items>
</m:CreateItem>
</soap:Body>
</soap:Envelope>
The server responds to the CreateItem request with a CreateItemResponse message that includes a ResponseCode value of NoError, which indicates that the email and the attachments were created successfully. The ItemId of the newly created message and the AttachmentId values for each of the attachments is also included in the response. The values of some attributes have been shortened for readability.
<?xml version="1.0" encoding="utf-8"?>
<s:Envelope xmlns:s="https://schemas.xmlsoap.org/soap/envelope/">
<s:Header>
<h:ServerVersionInfo MajorVersion="15"
MinorVersion="0"
MajorBuildNumber="939"
MinorBuildNumber="12"
Version="V2_11"
xmlns:h="http://schemas.microsoft.com/exchange/services/2006/types"
xmlns="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" />
</s:Header>
<s:Body xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<m:CreateItemResponse xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages"
xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types">
<m:ResponseMessages>
<m:CreateItemResponseMessage ResponseClass="Success">
<m:ResponseCode>NoError</m:ResponseCode>
<m:Items>
<t:Message>
<t:ItemId Id="upV4AAA="
ChangeKey="CQAAABYAAAAFI5DJmZv+TLtyLOLIF1S5AAAXuktU" />
<t:Attachments>
<t:FileAttachment>
<t:AttachmentId Id="6ts3NuI=" />
</t:FileAttachment>
<t:FileAttachment>
<t:AttachmentId Id="gOIZx1I=" />
</t:FileAttachment>
<t:FileAttachment>
<t:AttachmentId Id="esRan5I=" />
</t:FileAttachment>
<t:FileAttachment>
<t:AttachmentId Id="t7sU6s=" />
</t:FileAttachment>
<t:ItemAttachment>
<t:AttachmentId Id="XgDCggM=" />
</t:ItemAttachment>
</t:Attachments>
</t:Message>
</m:Items>
</m:CreateItemResponseMessage>
</m:ResponseMessages>
</m:CreateItemResponse>
</s:Body>
</s:Envelope>
To send this newly created message, call the SendItem operation.
Add an existing item to a new email by using the MimeContent and the EWS Managed API
To add an existing item as an item attachment to another item, you need to create a new item attachment and copy the content of the existing item to the new item. There are two ways to do this:
If you're working with email messages specifically, you can copy the value of the MimeContent property from the email into the newly created item attachment. You will lose some properties during this process, such as follow up flags and categories, but it works great for standard email messages.
If you need full fidelity for all item types, you can bind to an existing item and copy all the properties and extended properties into the new attachment.
The following code example shows the first approach, copying the MimeContent into the new item attachment. Following this example is a procedure that shows how you can modify the code to use the second approach.
This example assumes that service is a valid ExchangeService object and that the user has been authenticated to an Exchange server, and that the itemId is the ItemId of the item to attach.
public static void CreateEmailExistingItem(ExchangeService service, ItemId itemId)
{
// This method results in a GetItem call to EWS.
EmailMessage msgToAttach = EmailMessage.Bind(service,itemId,
new PropertySet(ItemSchema.MimeContent, ItemSchema.Subject));
// Create an email message and set properties on the message.
EmailMessage message = new EmailMessage(service);
message.Subject = "Message with Item Attachment (MimeContent)";
message.Body = "The attachment to this message was created by copying
the MimeContent from the original message and adding it to a new item attachment.";
message.ToRecipients.Add("sadie@contoso.com");
// Add an email message item attachment and set properties on the item.
ItemAttachment<EmailMessage> itemAttachment = message.Attachments.AddItemAttachment<EmailMessage>();
itemAttachment.Item.MimeContent = msgToAttach.MimeContent;
itemAttachment.Name = msgToAttach.Subject;
// Send the mail and save a copy in the Sent Items folder.
// This method results in a CreateItem and SendItem call to EWS.
message.SendAndSaveCopy();
}
To modify this example to copy each of the properties on the existing item into the new item attachment, do the following:
- Change the property set to include PropertySet.FirstClassProperties and any additional properties or extended properties you need.
// Add additional properties to the PropertySet.
EmailMessage msgToAttach = EmailMessage.Bind(service, itemId, new PropertySet(PropertySet.FirstClassProperties));
- Remove the following line, because you do not need the MimeContent property.
itemAttachment.Item.MimeContent = msgToAttach.MimeContent;
- Repeat this line for each property to copy from the existing item to the new attachment. Do not copy the ItemId into the new item attachment because that's a read-only property.
itemAttachment.Item.Subject = msgToAttach.Subject;
- Set the PidTagMessageFlags (0x0E070003) property on the attachment to Sent.
ExtendedPropertyDefinition sent = new ExtendedPropertyDefinition(3591, MapiPropertyType.Integer);
msgToAttach.Item.SetExtendedProperty(sent, "1");
Add an existing item to a new email by using the MimeContent and EWS
There are two ways to add an existing item to a new item:
If you're working with email messages specifically, you can copy the value of the MimeContent element from the email into the newly created item attachment. You will lose some properties during this process, such as follow up flags and categories, but it works great for standard email messages.
If you need full fidelity for all item types, you can bind to an existing item and copy all the properties and extended properties into the new attachment.
The following code example shows how to use the MimeContent element to copy the content of the original item into the MimeContent value of the new item attachment. The example uses the following operations:
GetItem — To get the MimeContent and Subject of the message that will become the item attachment on the new message.
CreateItem — To create the new email message.
CreateAttachment— To create the new attachment, using the MimeContent and Subject retrieved by the GetItem operation.
SendItem — To send and save the message.
The example starts by retrieving the MimeContent and the Subject of the existing item.
<?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="https://schemas.xmlsoap.org/soap/envelope/">
<soap:Body>
<m:GetItem>
<m:ItemShape>
<t:BaseShape>IdOnly</t:BaseShape>
<t:AdditionalProperties>
<t:FieldURI FieldURI="item:MimeContent" />
<t:FieldURI FieldURI="item:Subject" />
</t:AdditionalProperties>
</m:ItemShape>
<m:ItemIds>
<t:ItemId Id="jCrTAAA=" />
</m:ItemIds>
</m:GetItem>
</soap:Body>
</soap:Envelope>
The server responds to the GetItem request with a GetItemResponse message that includes a ResponseCode value of NoError, which indicates that the email was retrieved successfully, and the MimeContent and Subject of the email.
<?xml version="1.0" encoding="utf-8"?>
<s:Envelope xmlns:s="https://schemas.xmlsoap.org/soap/envelope/">
<s:Header>
<h:ServerVersionInfo MajorVersion="15"
MinorVersion="0"
MajorBuildNumber="944"
MinorBuildNumber="11"
Version="V2_12"
xmlns:h="http://schemas.microsoft.com/exchange/services/2006/types"
xmlns="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" />
</s:Header>
<s:Body xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<m:GetItemResponse xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages"
xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types">
<m:ResponseMessages>
<m:GetItemResponseMessage ResponseClass="Success">
<m:ResponseCode>NoError</m:ResponseCode>
<m:Items>
<t:Message>
<t:MimeContent CharacterSet="UTF-8">tDQe/Eo=…</t:MimeContent>
<t:ItemId Id="jCrTAAA="
ChangeKey="CQAAABYAAAAFI5DJmZv+TLtyLOLIF1S5AAAZi+7u" />
<t:Subject>Play tennis?</t:Subject>
</t:Message>
</m:Items>
</m:GetItemResponseMessage>
</m:ResponseMessages>
</m:GetItemResponse>
</s:Body>
</s:Envelope>
Next, call the CreateItem operation to create the new email.
<?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="https://schemas.xmlsoap.org/soap/envelope/">
<soap:Header>
<t:RequestServerVersion Version="Exchange2010" />
</soap:Header>
<soap:Body>
<m:CreateItem MessageDisposition="SaveOnly">
<m:Items>
<t:Message>
<t:Subject>Message with Item Attachment (MimeContent)</t:Subject>
<t:Body BodyType="HTML">The attachment to this message was created by copying the MimeContent from the original message and adding it to a new item attachment.</t:Body>
<t:ToRecipients>
<t:Mailbox>
<t:EmailAddress>primary@contoso1000.onmicrosoft.com</t:EmailAddress>
</t:Mailbox>
</t:ToRecipients>
</t:Message>
</m:Items>
</m:CreateItem>
</soap:Body>
</soap:Envelope>
The server responds to the CreateItem request with a CreateItemResponse message that includes a ResponseCode value of NoError, which indicates that the email was created successfully.
Next, create the new item attachment by using the MimeContent and Subject retrieved by the GetItem operation. The value of the ParentItemId element is populated by using the ItemId value returned in the CreateItem response.
<?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="https://schemas.xmlsoap.org/soap/envelope/">
<soap:Header>
<t:RequestServerVersion Version="Exchange2010" />
</soap:Header>
<soap:Body>
<m:CreateAttachment>
<m:ParentItemId Id="jDKsAAA=" />
<m:Attachments>
<t:ItemAttachment>
<t:Name>Play tennis?</t:Name>
<t:IsInline>false</t:IsInline>
<t:Message>
<t:MimeContent CharacterSet="UTF-8">tDQe/Eo=…</t:MimeContent>
</t:Message>
</t:ItemAttachment>
</m:Attachments>
</m:CreateAttachment>
</soap:Body>
</soap:Envelope>
The server responds to the CreateAttachment request with a CreateAttachmentResponse message that includes a ResponseCode value of NoError, which indicates that the attachment was created successfully, and the AttachmentId of the newly created attachment.
Now that the new message has been created, and the item was attached, you can send this newly created message by calling the SendItem operation.
<?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="https://schemas.xmlsoap.org/soap/envelope/">
<soap:Header>
<t:RequestServerVersion Version="Exchange2010" />
</soap:Header>
<soap:Body>
<m:SendItem SaveItemToFolder="true">
<m:ItemIds>
<t:ItemId Id="jDKsAAA="
ChangeKey="CQAAABYAAAAFI5DJmZv+TLtyLOLIF1S5AAAZi/q/" />
</m:ItemIds>
<m:SavedItemFolderId>
<t:DistinguishedFolderId Id="sentitems" />
</m:SavedItemFolderId>
</m:SendItem>
</soap:Body>
</soap:Envelope>
The server responds to the SendItem request with a SendItemResponse message that includes a ResponseCode value of NoError, which indicates that the email was sent successfully.
Create an email with an inline attachment by using the EWS Managed API
The following code example shows how to create an email with an inline attachment by:
Using the EmailMessage object to create an email message.
Setting the EmailMessage.Body property to an HTML body that includes an inline attachment.
Using the AttachmentCollection.AddFileAttachment method to add the attachment to the message.
Using the EmailMessage.SendAndSaveCopy method to send the message to the recipient and save the message in the Sent Items folder.
This example assumes that service is a valid ExchangeService object and that the user has been authenticated to an Exchange server.
public static void CreateEmailWithInlineAttachment(ExchangeService service)
{
// Create the HTML body with the content identifier of the attachment.
string html = @"<html>
<head>
</head>
<body>
<img width=100 height=100 id=""1"" src=""cid:Party.jpg"">
</body>
</html>";
// Create the email message.
EmailMessage message = new EmailMessage(service);
message.Subject = "Inline Attachment";
message.Body = new MessageBody(BodyType.HTML, html);
message.ToRecipients.Add("sadie@contoso.com");
// Add the attachment to the local copy of the email message.
string file = @"C:\Temp\Party.jpg";
message.Attachments.AddFileAttachment("Party.jpg", file);
message.Attachments[0].IsInline = true;
message.Attachments[0].ContentId = "Party.jpg";
// Send the mail and save a copy in the Sent Items folder.
// This method results in a CreateItem and SendItem call to EWS.
message.SendAndSaveCopy();
}
Create an email with an inline attachment by using EWS
The following code example shows how to use the CreateItem operation to create an email message with an inline file attachment. The BodyType attribute of the Body element indicates that the content is in HTML format and includes the image source. This is also one of the XML requests that the EWS Managed API sends when you use the EWS Managed API to create an email with an inline attachment.
<?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="https://schemas.xmlsoap.org/soap/envelope/">
<soap:Header>
<t:RequestServerVersion Version="Exchange2010" />
</soap:Header>
<soap:Body>
<m:CreateItem MessageDisposition="SaveOnly">
<m:Items>
<t:Message>
<t:Subject>Inline Attachment</t:Subject>
<t:Body BodyType="HTML">
&lt;html&gt;
&lt;head&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;img width=100 height=100 id="1" src="cid:Party.jpg"&gt;
&lt;/body&gt;
&lt;/html&gt;
</t:Body>
<t:ToRecipients>
<t:Mailbox>
<t:EmailAddress>sadie@contoso.com</t:EmailAddress>
</t:Mailbox>
</t:ToRecipients>
</t:Message>
</m:Items>
</m:CreateItem>
</soap:Body>
</soap:Envelope>
The server responds to the CreateItem request with a CreateItemResponse message that includes a ResponseCode value of NoError, which indicates that the email was created successfully, and the ItemId of the newly created message.
To send this newly created message, call the SendItem operation.
Add an attachment to an existing email by using the EWS Managed API
The following code example shows how to add an attachment to an existing email by:
Using the EmailMessage.Bind method to bind to an existing email message.
Adding a file attachment to the message by using the AddFileAttachment method.
Saving the updates by calling the EmailMessage.Update method.
This example assumes that service is a valid ExchangeService object and that the user has been authenticated to an Exchange server.
public static void AddAttachmentToExisting(ExchangeService service, ItemId itemId)
{
// This method results in a GetItem call to EWS.
EmailMessage message = EmailMessage.Bind(service, itemId);
message.Attachments.AddFileAttachment("C:\\temp\\FileAttachment.txt");
// This method results in a CreateAttachment call to EWS.
message.Update(ConflictResolutionMode.AlwaysOverwrite);
}
Add an attachment to an existing email by using EWS
The following code example shows how to use the CreateAttachment operation to add a file attachment to an existing email message. This is also one of the XML requests that the EWS Managed API sends when you use the EWS Managed API to add an attachment to an existing email.
<?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="https://schemas.xmlsoap.org/soap/envelope/">
<soap:Header>
<t:RequestServerVersion Version="Exchange2007_SP1" />
<t:TimeZoneContext>
<t:TimeZoneDefinition Id="Central Standard Time" />
</t:TimeZoneContext>
</soap:Header>
<soap:Body>
<m:CreateAttachment>
<m:ParentItemId Id="uqE2AAA=" />
<m:Attachments>
<t:FileAttachment>
<t:Name>FileAttachment.txt</t:Name>
<t:Content>VGhpcyBpcyBhIGZpbGUgYXR0YWNobWVudC4=</t:Content>
</t:FileAttachment>
</m:Attachments>
</m:CreateAttachment>
</soap:Body>
</soap:Envelope>
The server responds to the CreateAttachment request with a CreateAttachmentResponse message that includes a ResponseCode value of NoError, which indicates that the attachment was created successfully, and the AttachmentId of the newly created attachment.
<?xml version="1.0" encoding="utf-8"?>
<s:Envelope xmlns:s="https://schemas.xmlsoap.org/soap/envelope/">
<s:Header>
<h:ServerVersionInfo MajorVersion="15"
MinorVersion="0"
MajorBuildNumber="939"
MinorBuildNumber="12"
Version="V2_11"
xmlns:h="http://schemas.microsoft.com/exchange/services/2006/types"
xmlns="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" />
</s:Header>
<s:Body xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<m:CreateAttachmentResponse xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages"
xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types">
<m:ResponseMessages>
<m:CreateAttachmentResponseMessage ResponseClass="Success">
<m:ResponseCode>NoError</m:ResponseCode>
<m:Attachments>
<t:FileAttachment>
<t:AttachmentId Id="yRLhCh8="
RootItemId="uqE2AAA="
RootItemChangeKey="CQAAABYAAAAFI5DJmZv+TLtyLOLIF1S5AAAXulcf" />
</t:FileAttachment>
</m:Attachments>
</m:CreateAttachmentResponseMessage>
</m:ResponseMessages>
</m:CreateAttachmentResponse>
</s:Body>
</s:Envelope>