Server 2003上的Word 2003插件安装

I've had someone else's pile of stuff handed to me. Among these items is a Word 2003 add-in (VSTO 2005 SE, .NET 2.0) that reportedly had been working fine in 2007, but our deployment environment calls for 2003. It installs apparently fine for Office 2003 -- no errors, shows up in add/remove -- but the toolbar is unavailable within Word itself.I've had someone else's pile of stuff handed to