Hi Dave and welcome,
There are quite a few free and purchase applications available for this purpose. (Just be careful when Googling then as most claim free but end up as a trial). EOffice is probably one of the better ones. You can trial if from here;
Business & Finance - Word Processing BlackBerry Software | BerryReview Software Store
The not-to-distant future OS allows you to read MS Word and Excel docs so you might just want to wait a little while for it to become a native application.
Hope this helps.
Kind Regards,
Greg Myers.