09-05-2008 10:13 AM
You'd have to check with your carrier for when their releasing the 4.5 OS. But you can install 4.5 OS from another carrier. After you install it, but before you go through the Application Loader, just delete the vendor.xml file located in "C:\Program Files\Common Files\Research In Motion\AppLoader"
09-05-2008 01:13 PM
depends on your carrier. Some already have it.