I don't think this is possible, at least not without some hacking around, maybe something like an embedded remote desktop in your PPT or something (I have no idea whether that is feasible)
May I suggest that rather than moving the Tableau dashboard to the PowerPoint deck, you move the PowerPoint deck to Tableau? If your slides are bullet points and images this can all be mimicked using Dashboard objects.
Robin's suggestion is a really good one.
As he says, there is no real way to embed a (live) Tableau Dashboard into PowerPoint without Server. You could always export an image from Desktop and paste that it, though.
Thanks guys, seems like the functionality is just not there yet. Agree with Robin that in limited cases it may be possible to put the slides into Tableau - I'd have to look into it but I don't think this is a long term, viable solution as Tableau is not designed for this. Thanks also to Russell, though again this would not suit the purpose as I will just be moving from one static image to another - the key here is to turn a static PowerPoint (a tool that businesses across the world are comfortable with) and making it dynamic.
I hope at some point soon this kind of functionality can be added to Tableau, will keep my eyes peeled and report back if I end up finding a viable way to achieve this.
Very much appreciated!