A warning...there is a program that provides a separate email icon for work email on BES, but it doesn't work on OS 4.3, and Empower (who makes it) hasn't said if they will update it.
You should drop them a line and ask about it...my wife would love to have this app (she's on a BES) so she could have a separate work email icon, and the more who ask, maybe they'll update it.
Here's a link to the page on Empower's web site. As a result of my problems trying to get it to run on my wife's Pearl they added a 4.3 disclaimer. Empower Your BlackBerry