It seems like HTML email for BlackBerry devices is just around the corner. The new version 2.5. of BlackBerry Internet Service allows it and if the device is on OS version 4.5 it will render HTML. See this official RIM document for detailed information. Now it is just a question of how quick the carriers will update their BlackBerry Internet Service.
Meanwhile Vodafone Germany released OS 4.5 for all their devices. Now I hope it is just a matter of time until the corresponding versions of BlackBerry Enterprise Server and Professional services to enable the features of the new OS.




