BizTalk Server 2004 requires the .NET Framework 1.1

If you install the Microsoft .NET Framework 1.1 and the Microsoft .NET Framework 2.0 in side-by-side mode on a computer that is running Microsoft BizTalk Server 2004, you may experience the following issues:

• The BizTalk Service account must be a member of the local Administrators group of the server where BizTalk Server 2004 is installed.

• If you have installed Microsoft Visual Studio 2005 on the server, you will have a problem with publishing the orchestration as a Web service.
• For the published Web service to run, the script maps on the virtual directory must refer to Microsoft ASP.NET Version 1.1.4322. The Web site can be configured for Microsoft ASP.NET Version 1.1.4322 by using the Aspnet_regiis.exe administration utility. Also, in Microsoft Internet Information Services (IIS) 6.0 for Microsoft Windows Server 2003, the ASP.NET Version 1.1.4322 Web service extension must be enabled. You can do this by using the administration utility or by using the IIS Manager Microsoft Management Console (MMC) snap-in.
• Custom components that are written to use the .NET Framework 2.0 will not work in BizTalk Server 2004. These components include adaptors, pipeline components, functoids, and user code that may be referenced from orchestration or rules policies. Therefore, you cannot use Visual Studio 2005 to develop BizTalk Server 2004 projects.
• When you try to set instance breakpoints, you receive the following error message:
  The following error occurred when setting a breakpoint: Could not set interceptor configuration for the instance.
• Functoids disappear from the functoid pallet if a project that contains a map that uses functoids is opened. When you reset the functoid, the missing functoids are displayed.

This issue occurs because versions of BizTalk Server 2004 before BizTalk Server 2004 Service Pack 2 (SP2) were not designed to run on a computer that has the .NET Framework 2.0 installed.

To run BizTalk Server 2004 on a computer that also has the .NET Framework 2.0 installed, upgrade the computer that is running BizTalk Server 2004 to BizTalk Server 2004 SP2. BizTalk Server 2004 is only supported on a computer that has the .NET Framework 2.0 installed if BizTalk Server 2004 SP2 is also installed.