If you purchase the 300 it will come with the latest version of Blazer which is version 2.0. There are other browser alternatives available and I recommend taking a look at Xiino. It supports most javascript which Blazer does not.
http://palmgear.com/software/showsoftware....EC&prodID=42162
I've never heard of openmail. Are you sure that you got the name right? Same with onemail. Where you thinking of OneTouch? Help me out here so I can try and help you.