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If you are developing an application in an environment where different versions of the CDO Rendering library 1.x will be used, it is helpful to know the version of the CDO Rendering library 1.x to determine which functionality of the object library is supported with the particular version. This list provides you with the information, which is displayed at the Properties, Version of the particular file.

Version CDO HTML Library Comments
Exchange 5.0 1.1 Initial release of the CDO Rendering Library 1.1 (formerly known as 'Active Messaging 1.1 Rendering Library'). AMHTML.DLL file version 5.0.1457.x
Exchange 5.0 SP 1 1.1 Update release of the CDO Rendering Library 1.1 for Exchange Server 5.0. AMHTML.DLL file version 5.0.1458.58
Exchange 5.0 SP 2 1.1 Update release of the CDO Rendering Library 1.1 for Exchange Server 5.0. AMHTML.DLL file version 5.0.1460.13
Exchange 5.5 1.2 Initial release of the CDO Rendering Library 1.2x. The object library consists of the in-process OLE servers called CDOHTML.DLL. CDOHTML.DLL file version 5.5.1960.4
Some of the added functionality over the CDO Rendering Library 1.1 includes support for scheduling meetings and appointments. More detailed information on the feature set of CDO 1.2 can be found in the CDO.HLP.
This file is located on the Microsoft Exchange Server 5.5 CD-ROM. Note, that an updated version is included with the Microsoft Exchange Server 5.5 Service Pack 2. You can also download the most current version of CDO.HLP from CDOLive cdo.zip (1,065 Kbyte)
Exchange 5.5 SP 1 1.21 Update release of the CDO Rendering Library 1.2x for Exchange Server 5.5. CDOHTML.DLL file version 5.5.2232.5
Exchange 5.5 SP 2 1.22 Update release of the CDO Rendering Library 1.2x. CDOHTML.DLL file version 5.5.2448.4
Exchange 5.5 SP 3 1.22 Update release of the CDO Rendering Library 1.2x. CDOHTML.DLL file version 5.5.2650.24
Exchange 5.5 SP 4 1.22 Current release of the CDO Rendering Library 1.2x. CDOHTML.DLL file version 5.5.2653.23
Exchange 2000 6.0 Initial release of CDO HTML Rendering Library with Exchange 2000 Server. CDOHTML.DLL file version 6.0.4417.0.

Note that the current version of the CDO HTML rendering library only ships with Microsoft Exchange Server 5.5 and not with Microsoft Outlook 98. Microsoft do not allow it to be redistributed or run outside of a Microsoft Active Server Pages application. For more information please take a look at the Knowledge Base articles 'Where to Acquire the Collaboration Data Objects Libraries'. It can be found at Knowledge Base Articles about CDO & Scripting and Routing.