Each time I look at the calculator Microsoft provides on the Pocket PC or Smartphone, I am amazed at the fact that they have not improved it one bit in over a decade. The Pocket PC is a natural form factor for a great calculator. Fortunately, there are a number of freeware solutions available. Here’s one you might want to take a look at…
There are versions for Windows Mobile, Windows, and Palm OS.
Microsoft recently licensed a version of 1-Calc that you can download for free:
http://www.microsoft.com/windowsmobile/domore/applications.mspx
I have 1-Calc and it works well. The Lite version looks decent.