I'm confused...wasn't the question about html enabled mail on the BB...what does the forum display have to do with how much memory is used for html mail on the BB??
As for the answer it only makes sense to assume that html mail would use a little more memory as it includes formatting code (html) to display your message a certain way. I don't think its enough to cause alarm...its when you download the images for that email that memory consumption will go up. Of course if you keep your email clean and delete stuff don't need to keep it shouldn't really be an issue.
