Advansys only supports Archive To Go 3.0 with GroupWise 2014. A very significant percentage of the development work was dedicated to the code rewrite for supporting the new GroupWise 2014 REST Administration API used for Enterprise Mode. This is because the Admin Object API, supported by previous versions of GroupWise and used by Archive To Go 2.0 and earlier, was removed from GroupWise 2014.
Hopefully this helps clarify a major functional difference between Archive To Go 3.0 and previous versions.