[RESOLVED] VSTO for Office 2003?

Hey,

I have recently downloaded and used VSTO (Visual Studio Tools for Office) version 2005 SE.
I use it with Visual Studio 2005 and Office 2007.

Now however, I need to create a small application (add-in) for Word 2003. I figured I would need an earlier version of VSTO, since my current VSTO (2005 SE) shows only Office 2007 add-ins.

I did some searches but I just can't figure it out...:

1. What version of VSTO do I need, 2003 or 2005 (just 2005, not 2005 SE)
2. Is it available for free, like VSTO 2005 SE? I can't find any download links for version 2003 or 2005!

Thanks!