We have two BES 5.0.x Servers (In two different Physical locals /Multiple MS Exchange) with two separate configuration databases running currently. They both are currently using the same BESAdmin (BESAdmin1) account. Unfortunately we’ve come the realization that if “Site A’s” Exchange Server where the BESAdmin account is located goes down, so do both BESServers. So to avoid this, we’ve created a new BESAdmin (BESAdmin2) account with a mailbox on a different Exchange server. However, how does one go about changing the one BESServer from BESAdmin1 to BESAdmin2 with little down time on the users?

I really tried to shorten this post, but if I really explained my situation this would be the longest post ever..

Take a look at KB04293 (KB04293-How to switch BlackBerry Enterprise Server service accounts). This article walks you through the steps to change the service account. I've had to do this a couple times and assuming all permissions are assigned (AD, Exchange, local server, SQL), down time should be minimal (10-15 minutes).

Ok I checked up on this documentation, now let me ask this: Would not just be eaiser to createa new BES using the new account and point it to the same DB? Or should I just plan to create new DB's and migrate/transport users from old BES5.0.2 to new BES 5.0.2?

changing service accounts is very straightforward with the KB. Done it several times.

I don't understand what you're trying to do. Your first post just talked about changing the service account. Your second post is talking about installing a new BES. If you want, you can install a new BES in the existing BlackBerry domain with the new service account...but right now, without more information, I'm not sure what you're trying to do.

Since you are on 5.0 why not use BlackBerry Admin Service for each server rather than AD?