Andrew,

Thanks for all your details.

I find it, download (the NT version), unzip and register it but I'm not very lucky because the register operation failed with this message :
"LoadLibrary("C:\WINNT\system32\cdo.dll") failed - The specified module could not be found"

I make sure that the file exits in C:\WINNT\system32\ and it is for NT.

>Michael,
>
>Sorry for not being more explicit in my previous reply - I was in a rush. The file you're looking for is CDO_WINNT.EXE. You can find it at http://www.microsoft.com/exchange/downloads/cdo.htm (see also Q171440)
>
>Cheers,
>
>Andrew
>
>

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>
>>Andrew,
>>
>>I download Mfccdo.exe for NT4.0 from MS download center, unzip it and execute CdoMfc.exe which is in the subfolder Release. When I try to click on "Create and logon to MAPI.Session" I get the following message "CreateDispatch Failed".
>>
>>I have the same problem with SampCdo from the MS download site.
>>
>>>Do a search on CDO in on the MS site. Download CDO2.1 for NT and run it.
>>>
>>>All will be well.
>>>
>>>Cheers,
>>>
>>>Andrew
>>>
>>>

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>>>
>>>>>To send mails, I use MAPI.Session for W95 / W98 / NT4 and it works well. With W2000 my program fails on the following command : oSession = CREATEOBJECT("MAPI.Session")
>>>>
>>>>I see the same thing, what if you copy MSMAPI32.OCX from a 9x system into Windows\System and run RegSvr32 on it?