通过 EWS (Exchange WebServices) 获取所有邮箱 - 不是我自己的邮箱，还有共享邮箱和群组邮箱

Question

Can anyone provide me with a .NET (C# / VB) sample of how to get all mailboxes that I have access to?

I have only been able to get my OWN mailbox via EWS - not ALL THE OTHER mailboxes that I also have access to through Outlook.

I don't have the names nor the id's of these mailboxes but isn't it possible to retrieve ALL mailboxes - including my own - that I am allowed to see - just as I can in Outlook?

I am using Autodiscover to get my mailbox like this: service.AutodiscoverUrl("xxxx@ee.dd") - this will perhaps only get my own mailbox and not all the rest?

Please help??

Answer 1

You can do this by Using Autodiscover to get user settings , this is a completely separate service to the one with the AutodiscoverUrl method.

The setting name you need is AlternateMailboxes, this will give a collection of all the 'other' mailboxes you have access to. You might then add the user's default mailbox to get a complete list.

In c#:

using Microsoft.Exchange.WebServices.Autodiscover;  // from nuget package "Microsoft.Exchange.WebServices"

    internal List<string> GetAccessibleMailboxes()
    {
        AutodiscoverService autodiscoverService = new AutodiscoverService("outlook.office365.com");
        autodiscoverService.Credentials = networkCredential;
        var userSmtpAddress = networkCredential.UserName;

        GetUserSettingsResponse userresponse = autodiscoverService.GetUserSettings(
            userSmtpAddress,
            UserSettingName.AlternateMailboxes);

        var alternateMailboxCollection = (AlternateMailboxCollection)userresponse.Settings[UserSettingName.AlternateMailboxes];
        var smtpAddressList = alternateMailboxCollection.Entries.ToList().Select(a => a.SmtpAddress).ToList();

        smtpAddressList.Add(userSmtpAddress);

        return smtpAddressList;
    }

Answer 2

The way I got around this was to define the group mailbox in question as a "mailbox" object and then obtain the FolderID for the particular folder.

1. Define mailbox object

    Mailbox gpmailbox = new Mailbox("mailbox@yourdomainname.com"); 

2. Get the FolderID (in this case, the Inbox)

    FolderId gpInbox = new FolderId(WellKnownFolderName.Inbox, gpmailbox); 

3. Use FolderID in your normal code (in this case I'm obtaining 100 messages)

    ItemView view = new ItemView(100); FindItemsResults<Item> results = hookToServer.FindItems(new FolderId(WellKnownFolderName.Inbox, gpmailbox), view); 

The key is to grab the FolderID of the folder you need. Hope this helps.

Edit: I also failed to note that my object "hookToServer" is simply the ExchangeService object. Here's how I defined it:

        ExchangeService hookToServer = new ExchangeService(ExchangeVersion.Exchange2010_SP1);
        hookToServer.UseDefaultCredentials = true;
        hookToServer.Url = new Uri("TheExchangeServer")

I also used this as reference: EWS 2007 Group Mailbox Guide