MAPI/CDO for Server 2008 and Vista Available
Overview
The Messaging API is a COM-like API that provides access to the contents of messaging stores. CDO 1.2.1 (Collaboration Data Objects, version 1.2.1) is a package providing access to Outlook-compatible objects through a COM-based API. Using either CDO or MAPI, a program can connect to a MAPI store, and then perform operations against that store. Starting with Exchange 2007, Microsoft will distribute the MAPI client libraries and CDO 1.2.1 as a Web download.
System Requirements
- Supported Operating Systems: Windows Server 2003; Windows Server 2008; Windows Vista; Windows XP
- This package will not install on a system on which any version of Microsoft Outlook or Microsoft Exchange Server 2003 or earlier is installed.
This download is available here.
Elan Shudnow :: Jun.02.2008 :: Exchange ::

It seems like the Download URL does not work!
Should be fine now. Sorry about that.
First of all thanks for this thread
OK, thats fine what should i do if i have outlook installed in vista OS ????.
I’m trying to send email throw VB.NET 1.1, i tryed Web.Mail.MailMessage and it keep giving CDO.Message errors ???
Please help me by code or give a URL could help.
Thanks all.