To enable this feature, you must first apply a language pack. To do this, go to Start -> All Programs -> Microsoft Office -> Microsoft Office Tools -> Microsoft Office 2003 Language Settings
In the list of Available Languages, select "Akkadian"
Click Add >> and then Click OK. You will need to restart InfoPath.
This will also install all the files needed for the Voynich, Vinca, Iberic, Etruscan, Linear A (Minoan form), Linear B (Greek form), and Rongo Rongo language support. Please be aware that the default currency will be switched to zuzu and the default date format will be synodic.
Cuneiform support is especially powerful when combined with Microsoft's Tablet platform.
(Picture of the InfoPath editor in Akkadian)