Download details: InfoPath 2003 Software Development Kit (SDK)

Download details: InfoPath 2003 Software Development Kit (SDK): "The InfoPath 2003 Software Development Kit (SDK) download contains sample forms, tools, and documentation to assist with Microsoft Office InfoPath 2003 and InfoPath 2003 Service Pack 1 form development and deployment."

System Requirements
Supported Operating Systems: Windows 2000 Service Pack 2, Windows Server 2003, Windows XP

This download works with the following applications:

Microsoft Office InfoPath 2003
Microsoft Office Access 2003
Microsoft Office Word 2003
Some of the developer sample forms and procedures require the following components:

Microsoft Windows SharePoint Services
Microsoft Internet Information Services (IIS)
Microsoft Office Outlook (or compatible e-mail client)
Microsoft Simple Mail Transfer Protocol (SMTP) Service
Microsoft .NET Framework 1.0 or 1.1
Microsoft Visual Studio .NET (with C#)
Microsoft SQL Server (and the Northwind database)
Microsoft BizTalk Server 2002 and 2004
Microsoft ASP.NET