Accessing Exchange mailbox from WinForm

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Jay Williams - 20 Mar 2006 23:19 GMT

Can someone give me some C# sample code for retrieving mail from an Exchange
folder (such as "Inbox" or "Sent Items") using Windows Authentication from a
WinForm app? Or, just point me to a website that has a sample.

How does Outlook do all of its stuff? I suspect this is how I would want to
do it.

Thanks,
Jay

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Henning Krause [MVP] - 20 Mar 2006 23:53 GMT

Hello,

Outlook uses MAPI.. and from C# you don't want to use this :-) Actually,
it's not even supported.

One method you can use is WebDAV. You can find some examples here:
http://msdn.microsoft.com/library/en-us/e2k3/e2k3/_esdk_key_tasks.asp and
the reference here:
http://msdn.microsoft.com/library/en-us/e2k3/e2k3/_webdav_web_store_http_webdav_
protocol_reference.asp

All communications are done with the HttpRequest Class, which supports
Windows Authentication.

Greetings,
Henning Krause

> Can someone give me some C# sample code for retrieving mail from an
> Exchange
[quoted text clipped - 8 lines]
> Thanks,
> Jay

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Jay Williams - 21 Mar 2006 00:33 GMT

Thanks for your response.

I have a few questions, however:

1) Why does Outlook use MAPI and why shouldn't I?
2) I see, in the sample code you directed me to that they'r doing the
following (with WebDAV):

MyCredentialCache.Add(new System.Uri(strRootURI), "NTLM",
new System.Net.NetworkCredential(strUserName, strPassword, strDomain));

Is there a way I can simply pass along the Credentials via the Windows
Principal or Windows Identity so that I don't have to type in a username and
password? If not, what's the point of Windows Authentication?

I want anyone on our network to be able to fire up this app and see their
own Inbox (for example) without having to type anything in. After all,
they're already Authenticated by Windows. Why should I have to have them type
anything else it?

Thanks a ton!
Jay

> Hello,
>
[quoted text clipped - 24 lines]
> > Thanks,
> > Jay

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Dan Mitchell - 21 Mar 2006 01:55 GMT

=?Utf-8?B?SmF5IFdpbGxpYW1z?= <JayWilliams@discussions.microsoft.com>
wrote in news:A36675FA-E7BA-46F6-832F-5984FEB731F9@microsoft.com:

> 1) Why does Outlook use MAPI and why shouldn't I?

Because Outlook isn't a .Net application.

And why shouldn't you use MAPI? To quote from one of the MS support folks
on one of these newsgroups a while ago:

"It's the sort of thing that'll mostly work. It'll work while you're
writing it. Then it'll work while you're testing it. It'll work while your
customer is evaluating it. Then as soon as the customer deploys it - BAM!
That's when it'll decide to start having problems. And Microsoft ain't
gonna help you with it, since we told you not to do it in the first place.

:)"

See
http://groups.google.com/group/microsoft.public.win32.programmer.messaging
/msg/20149ae3de2f4920?hl=en& for that posting, and

http://support.microsoft.com/kb/813349 for more.

I don't know much about the WebDAV end of things, sorry.

-- dan

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Henning Krause [MVP] - 21 Mar 2006 11:55 GMT

Hello Jay,

Dan already answered the first question.

As with your second question:

You can simply use request.Crededentials =
CredentialCache.DefaultCredentials.

this will use integrated authentication.

Greetings,
Henning Krause

> Thanks for your response.
>
[quoted text clipped - 51 lines]
>> > Thanks,
>> > Jay

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