A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
this is no longer very useful. The link is still there but requires you to have Visio 2010 only, it will not work with later versions.
For future visitors, a converter isn't really needed any more, simply select all and copy from your powerpoint, then open a new visio and paste. The lines/text will copy over as objects not as a bitmap/image. You will have to do some cleanup to group them as objects but it works!