I have a BIG Powerpoint presentation on Forgotten Futures I run on my laptop at games conventions etc. To make this clear, I just have it running on the screen, not on a projector etc. There isn't a standard page template for this presentation, there's a lot of variation in layout, position of graphics, etc., some pages have a little animation, etc.

The problem is that it is formatted for my old laptop's screen layout, 4:3, and not to the new Macbook Pro's 16:9, so when it's viewed on the new computer there are black bars to either side of the image.

If you try to change the slide width in Office 2008 for Mac it tries to expand the page vertically and horizontally, which is useless, since the bottom of text and images is often cut off. What I would like to do, initially, is simply expand all of the page BACKGROUNDS to the new layout while leaving the slides otherwise unchanged. I can then think about altering their layout on an individual basis.

I'm sure there has to be a way to do this, I just can't seem to figure it out. Microsoft's web site, as usual, seems to be about as much use as a chocolate teapot.

Anyone know an easy way to do this?