The Blackjack is not a pocket pc but rather a smart phone. Heres a clipping from Cnets review of the Blackjack:

One of the main differences between the BlackJack and the Cingular 8525 is the phone operating system. While both phones run Windows Mobile, the BlackJack uses the Smartphone Edition, while the 8525 uses the Pocket PC Phone Edition. As such, you won’t get the Microsoft Office Mobile Suite or document editing capabilities on the BlackJack. Instead, you get an application called Picsel Viewer Suite, which allows you to only open and view Word and Excel documents, PowerPoint presentations, and PDFs. We were able to transfer and open such files successfully with the BlackJack. Other tools include: a calendar; contacts lists; task lists; other notes; a voice recorder; a calculator; a stopwatch; a world clock; and a unit converter.

Where it says you can open and view things I dont think you can edit or create them. This review is old, and if you went to cnets site with the specific model you were looking at, it would be of a better indicator to what you could do with it.

There are 3rd party programs for word processing and spreadsheets for most smartphones, pdas, pocket pcs or ppc, etc…. go to the second link, On the left hand side expand the dropdown menu for “mobile software” and pick the operating system of your device.

Hope this helps.