I currently work within the MC growth platform at ACN, and would like to move into the strategy area. Anyone know about whether this internal move is viable? Thanks.

Almost anything is possible, probably depends what your experience or quals are, what level you are, which of the service lines you are in and if you know someone in strategy.

there's a recurring pattern of people asking on this public forum how to effect a move within their company - frankly if you haven't got the gumption to research, network around and push yourself forward internally, it ain't gonna happen based on some advice here...