In MS Visual C++ 2010
I had a single C++ project in my solution which used boost and worked perfectly.
I then decided to convert this project into a static
Did you build boost library? There are certain libraries in Boost that needs to be compiled. In case if you haven't done that, refer to "Getting started in Windows" on how to build the Boost library.
EDIT-1: Boost can be built both as a static and dynamically loadable (dll) libraries.
EDIT-2: If you have already built Boost, then the answer by @Daniel Gehriger tells you how to add it in VS.