We blogged about the availability of the upgrade for Office Mobile last week. The upgrade is only available if you already own a copy of the earlier version of Office Mobile on your device. Now, if you’re looking to add Office Mobile 6 for your handheld and you don’t have a previous version you can purchase it outright. Of course that will set you back $49.95, which I think is a tad expensive. Office Mobile 6 allows you to read the new Office 2007 file format natively on your mobile device, so that’s where the value is if you need that compatibilty.