Late last week, Microsoft made Office available on the iPad. There have been plenty of reviews by now, but Jen Underwood of Impact Analytics has the best review I’ve seen from a BI perspective. Checkout her review at New Microsoft Office Excel on iPad Native App
New Microsoft Office Excel on iPad Native App : Impact Analytix: Business Intelligence, Predictive Analytics & Excel
Archived post from 2014. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.