CDO 1.21 is no longer being developed or supported by Microsoft. You can download the standalone version of MAPI along with CDO 1.21 from -us/download/details.aspx?id=42040. It was last updated in 2014 and no new bug fixes are expected. Functionality wise it has not been updated for the last 15 years.

The dynamic-link libraries (DLLs) for CDO (1.1, 1.2, 1.21) and CDO Rendering (1.1, 1.2) are MAPI client object libraries. As such, they require MAPI and service providers (for example, the same service providers as with Microsoft Exchange Server).



Collaboration Data Objects for NTS (CDONTS) is a Simple Mail Transfer Protocol (SMTP) based Messaging offering, which is part of the overall CDO (1.1, 1.2) Library, but is not MAPI dependent.



Collaboration Data objects for Windows 2000 (CDOSYS), is a quantum leap in SMTP Messaging over CDONTS. CDOSYS provides for rich content through extensive MIME support.



The names of these files vary depending on the version of CDO as noted in the following table:



Cdo.dll Version 1.21 Download


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Collaboration Data Objects (CDO) 1.2.1 is not supported with Outlook 2010 

Note CDO version 1.2.1 refers to the version of the API not the version of the DLL which implements the API. The DLL contained in the Outlook 2007 CDO download is version 6.5. This is not an update to CDOSYS which is referred in this article as version 6.0.


When using Exchange to install CDO 1.21, you can use one of the following methods to install:

The test user has calendar and task info set via an Outlook client (and OWA too), we've reregistered the CDO.dll (version 1.21) too and set write permissions for Everyone on the system TEMP directory. MS support suggest there may be issues with the .asp scripts, any suggestions?

The following code works for me with Outlook 2003. You must set references to the Outlook Object Library and Microsoft CDO 1.21 Library (cdo.dll) in the VBA project via the Tools - References menu, otherwise it won't compile. Also, change the saveInFolder string in the code to a valid Windows folder on your computer.

CDO.DLL, also known as a Collaboration Data Objects 1.21s for Windows NT file, was created by Microsoft for the development of Microsoft Exchange. DLL files fall under under the Win32 DLL (Dynamic link library) file type category.

Below are the snippets I have that get the OOF status and to enable/disable OOF based on various searches I have performed. It looks like CDO 1.21 would be the easiest way to go, but Outlook 2010 seems to not support CDO 1.21.

Para resolver rpidamente su problema, le recomendamos que descargue y utilice cdo.dll Fix Tool. Si tiene experiencia tcnica y quiere instalar un archivo DLL manualmente, por favor seleccione su versin de Windows y descargue cdo.dll, despus de eso cpielo en el lugar apropiado usando la instruccin de abajo, arreglar los errores dll.

cdo.dll - archivo dll llamado "Collaboration Data Objects 1.21s for Windows NT" es una parte del programa Microsoft Exchange desarrollado por Microsoft Corporation. e24fc04721

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