To download MSXML SDK, go to the XML Downloads page of MSDN Online Library and choose the appropriate MSXML version. The MSXML header file and library are installed when installing the MSXML SDK. In order to build an application written in C++, a MSXML header file has to be included, and the project has to link to a MSXML library. To download the latest version of MSXML, see the XML Downloads page of the MSDN Online Library. MSXML 6.0 provides security and performance improvements over earlier MSXML versions. It is recommended that you upgrade from earlier versions of MSXML to MSXML 6.0. Instead, you should validate your application with the latest service pack of the version of MSXML that you use. It is not recommended to use Windows OS Side-by-Side (WinSxS) installations. This can be done by installing MSXML 4.0 in Windows OS Side-by-Side (WinSxS) mode. The only MSXML version where it is an option to have a later SP version installed without replacing the previous one is MSXML 4.0. For example, a new service pack for MSXML 3.0 completely replaces the previous installation of MSXML 3.0, but does not affect an installation of MSXML 6.0. When a service pack is installed for a version of MSXML, the service pack will completely replace the previous installation of that version.
For example, MSXML 6.0 will install side by side with MSXML 3.0 and will not impact existing applications that use MSXML 3.0. MSXML side-by-side installation allows multiple versions to be loaded in memory and used simultaneously by separate applications that depend on different versions of MSXML. MSXML 5.0 for Microsoft Office Applications is only available with Microsoft Office 2003 and is not covered in this topic.
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