Lower Algebra: Abelian categories =?= Modules over the monoidal category of Abelian groups

Hi all, I was wondering if any of you could help with the following mathoverflow question: http://mathoverflow.net/questions/141177/lower-algebra-modules-over-the-mono... I would repeat it here but the lack of formatting makes it difficult. Thanks in advance, Justin [For admin and other information see: http://www.mta.ca/~cat-dist/ ]