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Exchange 2010 with BlackBerry Server Express

Hi all,

We are currently running MS Exchange 2010 with Blackberry Enterprise Server Express with around 20 users in our organization.
All BlackBerry Enterprise Server Expression components (including SQL Express and BB Database) are installed on one single Exchange Server (Client and Hub Transport Roles).

We have got one single domain and both Exchange and Blackberry have been running alright for the last 12 months.

Now we are about to implement Exchange CAS Array with Network Loading Balance.

Basically, we need to add one more Exchange Client Server and configure the RPC Client.

The Exchange side of things is pretty much covered with no issues so far.

My question is more about the Blackberry Enterprise Server Express.

How can we ensure the messages on Blackberry will be delivered to their client/devices when Exchange is working under NLB?

Is there any way to make Blackberry Enterprise Server Express work with redundancy, I mean in parallel with 2 Exchange Client Server without sending duplicated messages or delivery failures?

Has anyone ever implemented something similar to this environment?

Any help is much appreciated!
Watch Question

_When you set up NLB, you'll likely set up a client access server array that has a single hostname (such as ExchangeNLB.mydomain.com). That hostname will point to the IP shared by the NLB cluster and that is what Outlook clients will connect to. With BES, you just point it at that same hostname.

The way NLB works is that the client access servers both respond to requests to the shared IP address but never at the same time. They have an algorithm so that only one machine response to any given request. Given that, you will not have duplicate requests from Outlook or BlackBerry Enterprise Server.
You can also add second BES server in your existing BES pool and without having any issue and make BES database mirror on the second BES sql server so that it can work when first server goes down.

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