MSMXL installation error.

While performing the "Add Server to Pool" operation during installation of OCS 2007 on an x64-bit platform with 64-bit Windows 2003 R2 you receive the following install error:

"MSXML6.0 Package Not supported on Processor Type"

more..info
Error Message 0xC3EC796A MSI installation was unsuccessful. Install MSXML Parser Error. The Error appears, when the system tries to install msxml6.0 with the message, MSXML6.0 package not supported on processor type.

While one would think that there must be fix for this, I later discovered that Office Communications Server 2007 will not install onto a 64-bit OS. Microsoft's UC SWAT team stated that Office Communication Server 2007 can only be installed on 32-bit Operating System, which of course can be installed onto a x32 or x64 machine. If you look within Microsoft's planning documentation there was mention of supported configurations; however 64-bit OS configurartions were not explicit. They have published an updated OCS support document, but of course for those of you who have been involved with deploying OCS for a while now, probably would not have gone back to verify anything as changed. Unless of course something like my particular issue surfaces... You live you learn I guess.. Below is a published list of supported configurations.

Supported configurations:

Supported Operating Systems for Enterprise Edition Office Communications Server 2007 Enterprise Edition requires one of the following operating systems. All operating systems are 32-bit editions.
• Windows Server 2003 R2 Standard Edition
• Windows Server 2003 R2 Enterprise Edition (recommended)
• Windows Server 2003 R2 Datacenter Edition
• Windows Server 2003 Service Pack 1 Standard Edition
• Windows Server 2003 Service Pack 1 Enterprise Edition
• Windows Server 2003 Service Pack 1 Datacenter Edition

Supported Operating Systems for Back End Database Server Office Communications Server 2007, Back-End Database, requires one of the following operating systems. All operating systems are 32-bit versions.
• Windows Server 2003 R2 Standard Edition (recommended)
• Windows Server 2003 R2 Enterprise Edition
• Windows Server 2003 R2 Datacenter Edition
• Windows Server 2003 Service Pack 1 Standard Edition
• Windows Server 2003 Service Pack 1 Enterprise Edition
• Windows Server 2003 Service Pack 1 Datacenter Edition

Supported Operating Systems for Communicator Web Access The following software must be installed on the computer on which you will be installing Communicator Web Access:
• Windows Server 2003 R2 or Windows Server 2003 SP1
• Windows Installer 3 (included in Windows Server 2003 SP1)
• IIS 6.0
• .NET Framework 2.0, including ASP.NET 2.0So until the next release plan for 32-bit OSs for all the server roles except for Backend Database server.