Is there anyway to keep messages you receive on other email providers such as Gmail from bleeding into the main messages box. If possible, I would like them to stay in the folder that gets created when you setup e-mail addresses in BIS because I do not want them mingling with my BES e-mails.

Anyway to implement this?

First off those are not folders. All messages go into a single list called Messages. The other Icons that you are using are merely shortcuts to a pre-set filter for this list, with the added function os setting the outgoing email addres to that account. You can set up your own shortcut filter in Messages Options using the search Function and assign a shortcut key for the new filter. You can't create an icon for it on the Home Screen but when in the message app you can use the shortcut to limit the list to you BES emails.

Hope this helps.
Rcbjr