I see a lot of posts recommending that users be sure and upgrade their OS on the handheld to 4.0. How is this done? Does a user merely have to upgrade their desktop manager to the latest version? I am very confused because I also heard that the desktop manager is no longer necessary for Blackberry Enterprise Server 4.0. Can someone please advise me?

Hi - there are some excellent Sticky Threads with tons of information about the BlackBerrys. In this one - http://www.blackberryforums.com/showthread.php?t=3851 - there is a particularly well written thread about upgrading the handheld operating system...

http://www.blackberryforums.com/showthread.php?t=1871

Good luck.