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SMTP, IMAP, EWS, POP3, S/MIME .NET library

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EWS - advanced features

On this page:

The sample code on this page assumes you have already connected and authenticated to an Exchange server.

Accessing shared mailboxes 

To perform an operation on a shared mailbox (or another mailbox), construct folder IDs specific to that mailbox and use them to work with the shared mailbox: 

// create EWS client instance, connect, log in
// ...

// get ID of the 'Inbox' folder in a shared mailbox 'shared@example.org'
var folderId = new EwsFolderId(EwsSpecialFolder.Inbox, "shared@example.org");

// work with the shared mailbox folder
bool exists = ews.FolderExists(folderId, "Orders");

' create EWS client instance, connect, log in
' ...

' get ID of the 'Inbox' folder in shared mailbox 'shared@example.org'
Dim folderId = New EwsFolderId(EwsSpecialFolder.Inbox, "shared@example.org")

' work with the shared mailbox folder
Dim exists = ews.FolderExists(folderId, "Orders")

Impersonate as another user 

Impersonation makes it possible to use an account to log into Exchange server but then act as different user. To enable impersonation, use Settings.Impersonation property: 

// create EWS client instance, connect, log in
// ...

client.Settings.Impersonation = new EwsImpersonation();
client.Settings.Impersonation.SmtpAddress = "impersonated.user@example.org";

' create EWS client instance, connect, log in
' ...

client.Settings.Impersonation = New EwsImpersonation()
client.Settings.Impersonation.SmtpAddress = "impersonated.user@example.org"

To switch back to the logged-on user, disable impersonation by setting Settings.Impersonation property to null: 

// turn impersonation off
client.Settings.Impersonation = null;

' turn impersonation off
client.Settings.Impersonation = Nothing

Synchronization and cumulative updates of items and folders 

Exchange servers make it possible to retrueve a set of items or folders that have been changed since previous checkpoint.

The first checkpoint identifier is obtained with the initial set of changes. In the next query, use the identifier to get changes that occured since the previous query.

To synchronize items, use GetUpdatedItems method: 

// create EWS client instance, connect, log in
// ...

// get 100 changes at most
int maxChangesCount = 100;

// get an initial set of changes
EwsUpdatedItemsInfo changes = ews.GetUpdatedItems(folderId, EwsItemFields.Default, maxChangesCount, null);

// ...
// do some work with the changes
// ...

// later, get the next set of changes using a checkpoint from the last query
changes = ews.GetUpdatedItems(folderId, EwsItemFields.Default, maxChangesCount, changes.Checkpoint);

' create EWS client instance, connect, log in
' ...

' get 100 changes at most
Dim maxChangesCount As Integer = 100

' get an initial set of changes
Dim changes As EwsUpdatedItemsInfo = ews.GetUpdatedItems(folderId, EwsItemFields.Default, maxChangesCount, Nothing)

' ...
' do some work with the changes
' ...

' later, get next set of changes using a checkpoint from the last query
changes = ews.GetUpdatedItems(folderId, EwsItemFields.Default, maxChangesCount, changes.Checkpoint)

To synchronize folders, use GetUpdatedFolders method: 

// create EWS client instance, connect, log in
// ...

// get initial set of changes
EwsUpdatedFoldersInfo changes = ews.GetUpdatedFolders(folderId, null);

// ...
// do some work with the changes
// ...

// later, get the next set of changes using a checkpoint from the last query
changes = ews.GetUpdatedFolders(folderId, changes.Checkpoint);

' create EWS client instance, connect, log in
' ...

' get an initial set of changes
Dim changes As EwsUpdatedFoldersInfo = ews.GetUpdatedFolders(folderId, Nothing)

' ...
' do some work with the changes
' ...

' later, get the next set of changes using a checkpoint from the last query
changes = ews.GetUpdatedFolders(folderId, changes.Checkpoint)

Resolving names 

To resolve a name, use ResolveNames method. This searches among mailbox (user) names and contact names. 

// create EWS client instance, connect, log in
// ...

// find all mailboxes and contacts with 'Joe' in name
IList<EwsResolvedName> list = ews.ResolveNames("Joe");

// print info about mailboxes and contacts found
foreach (var info in list)
{
    Console.WriteLine(info.Name);
    Console.WriteLine(info.EmailAddress);
}

' create EWS client instance, connect, log in
' ...

' find all mailboxes and contacts with 'Joe' in name
Dim list As IList(Of EwsResolvedName) = ews.ResolveNames("Joe")

' print info about mailboxes and contacts found
For Each info In list
    Console.WriteLine(info.Name)
    Console.WriteLine(info.EmailAddress)
Next

Determining Exchange server version 

Use properties of Ews.Server object to retrieve information about the Exchange server: 

// create EWS client instance, connect, log in
// ...

// print info about the server
Console.WriteLine("Exchange server: {0} (version {1})",
    ews.Server.ProductName,
    ews.Server.Version);

' create EWS client instance, connect, log in
' ...

' print info about the server
Console.WriteLine("Exchange server: {0} (version {1})", _
    ews.Server.ProductName, _
    ews.Server.Version)

Deleting permanenty or to a folder 

Use DeleteMode property to choose what to do when delete operation is invoked.
Enum Description
EwsDeleteMode.MoveToDeletedItems Deleted items are store in user's "Deleted Items" folder. Folder name can be differnet in different language versions.
EwsDeleteMode.Permanent Deleted items are removed permanently.

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