This article was previously published under Q315197
Microsoft Windows Server 2003 does not install Collaboration Data Objects (CDO) for NTS (CDONTS). Therefore, applications that use CDONTS do not function on a Windows Server 2003-based computer.
Windows Server 2003 provides improved alternatives to CDONTS. To make applications that use CDONTS function on a Windows Server 2003-based computer, update existing CDONTS applications to use one of the following technologies:
CDO for Windows 2000 CDO for Windows 2000 provides a broader functionality set than CDONTS. This functionality includes the ability to send messages through a remote Simple Mail Transfer Protocol (SMTP) server. You can use CDO for Windows 2000 (CDOSYS) in applications that are not Microsoft .NET Framework-based. For example, Microsoft Visual Basic 6.0 and Microsoft ASP are not based in the .NET Framework. You can also use CDOSYS in .NET Framework applications.
System.Web.Mail The System.Web.Mail namespace provides a managed wrapper for CDOSYS. The System.Web.Mail namespace is only available in .NET Framework applications.
CDO for Windows 2000
For more information about CDOSYS, click the following article numbers to view the articles in the Microsoft Knowledge Base:
286430 How to send HTML formatted mail using CDO for Windows 2000 and the local pickup directory
286431 How to send HTML formatted mail using CDO for Windows 2000 and a remote SMTP service
For more information about System.Web.Mail, click the following article numbers to view the articles in the Microsoft Knowledge Base:
314201 How to send e-mail programmatically with System.Web.Mail and Visual Basic .NET
310273 How to send e-mail programmatically with System.Web.Mail and Visual C# .NET