No, there is no way to change the default email sound. Although, if you download the free ap TextNow, you can easily change your text notification sounds by going under settings.
Gosh, well that's inconvenient. Why in the world did it just suddenly change? I really dont like it. I will try the app you mentioned. Thanks so much.
Hi Yellowspotlight. I'm very new to the Nook HD+ tablet but I think I might be able to help you if I'm understanding your question correctly. On my Nook HD+ if I go to "Settings" (from a shortcut I put on my tabletop), then "Applications", then "Email", then long hold the Email account (I only have 1) in the list on the left, it takes me to another screen, and about 2/3 of the way down there's an option to "Choose ringtone". I'm using the most recent Nook HD+ update -- 2.1.1. (Ironically, when my tablet did its own auto-update it stopped at 2.1.0. I had to go and manually update to 2.1.1.) Hope this helps.
(Also...there's an option to turn the Notifications ringtone down to make it less intrusive. I have mine turned down as low as it'll go without completely turning it off. It's located at the "Settings"/ General tab.)