CDONTS Collaboration Data Objects (CDO) for
Microsoft® Windows NT® Server (CDONTS) has been removed from Microsoft®
Windows® Server 2003. If your Web applications use CDONTS, you can
modify your code to use Collaboration Data Objects for Windows 2000
(CDOSYS), which is supported by Windows Server 2003. However, if you
upgrade to Windows Server 2003, CDONTS remains on your server, because
Cdonts.dll is not removed during an upgrade to Windows Server 2003.
CDONTS is not installed when you perform a clean installation of
Windows Server 2003, but if necessary, you can copy it to the computer
running Windows Server 2003 and register it.

To add CDONTS to Windows 2003 do the following.

On the source Windows 2000 server (Planet2 is win2k, but only
access if you have ok for that), copy Cdonts.dll from the
systemroot\system32 folder to a floppy disk.

On the target Windows 2003 server, copy Cdonts.dll from the floppy disk to the folder systemroot\system32.

To register CDONTS, on the target server, in the Run dialog box, type cmd, and then click OK.

At the command prompt, change to the systemroot\system32 directory, and then type:

If the process is successful, the following message displays:

DllRegisterServer in cdonts.dll succeeded.

Click OK.

*Added Plesk info*

If a server has Plesk installed on it You must do the following or the symptoms outlines in http://support.microsoft.com/default.aspx?scid=kb;EN-US;197619


will occur.

1) Go to C:\inetpub\mailroot


2) Add the IUSR to all folders


3)Make sure the IUSR has modify (read ,write ,execute) privileges to these folders


4)Restart Plesk Mail Services


5) Configure IIS smtp to run on port 26


6) Go to Service and change SMTP from disabled to automatic


7) In IIS start the SMTP server.