Creating a custom ribbon button in VS 2008 Standard

Question

I want to create a custom ribbon button within Outlook 2007 using Visual Studio 2008 Standard, but am unsure how to proceed. Most of the resources I've found mention VS 2008 Pro, and this SO answer mentions that VSTO is not even included in Standard.

Is creating custom ribbon buttons possible using Visual Studio 2008 Standard? If so, where should I start?

Answer 1

Adding Custom Dynamic Menus to the Office Fluent User Interface turns out to be a decent introduction, and this guide to Office PIAs has also come in handy.