Interoperating multiple application server versions
WebSphere® Application Server Version 9.0 is interoperable with other versions of the product under certain conditions.
Before you begin

This article is about profile configuration migration. To migrate your applications to the latest version, use the WebSphere Application Server Migration Toolkit. For more information, see the Migration Toolkit on WASdev.
sptcfgRead Overview of migration, coexistence, and interoperability and Migration considerations. For resources to help you plan and perform your migration, visit Knowledge Collection: Migration planning for WebSphere Application Server.
Interoperability applies to WebSphere administrative actions, administrative communication and to application client requests. WebSphere Application Server Version 9.0 is generally interoperable with Version 7.0 or later. You should apply the latest fix level to support interoperability. In order to interoperate between WebSphere Application Server for z/OS® and a WebSphere Application Server product on a non-z/OS machine, however, you must follow this procedure.
For web application clients, interoperability is provided by employing the HTTP server plug-in at the highest version of all of the application servers in the cell. For example, a cell comprised of WebSphere Application Server Version 9.0 and Version 8.0 application servers would use a supported HTTP server with a Version 9.0 plug-in. See Technote Web server plug-in policy for WebSphere Application Server for more information.
Procedure
What to do next
This information is dynamic and might be augmented by information in technical articles that are available on the IBM® DeveloperWorks WebSphere site. Check the site for the latest information.