If you have installed the latest 4.5 OS to your Blackberry device, you’ll notice as part of Documents to Go included in the OS package, you’ll get Word to Go and Slideshow to Go, but no Sheet to Go (which is for editing Excel files).
Have no fear, you can simply register your software on your device. You’ll receive your registration number via email. Then browse to http://www.dataviz.com/customerservice/login/index.html pages, login and you’ll be able to get the latest Documents to Go package (1.02 as of this writing) and it includes Sheet to Go. One warning, the download is around 2Mb. so watch out, you might go over your plan’s limit. Makes you wonder why they don’t offer alx/cod