Here's what I'm trying to do.

I have a BES server running 4.0.5. I want to retire this server and bring up a new BES server on new hardware running 4.1.2.

What's the best way, with the least impact to the users, to migrate the users from the old server to the new server?

We have about 80 BB users, most of whom are travelling so I would like to try to pull this off without having to have the users do anything to their devices.

Any advice would be appreciated.

Thank you.

I'm assuming as you have one server you are not using SQL?

ITs not looking good to do this without user interaction, I have just upgraded from 4.0.5 to 4.1.2 today and its pretty straight forward if you leave it on the same hardware and just upgrade.

Currently we have one server yes. It is using MSDE for the database.

The original server was not configured properly and we would like a clean install of the BB software. In addition, we are looking to virtualize the BES server so an in place upgrade is not an option for us.

What I would do is this.

Setup the new server and apply all the updates, install SQL Server. Then move the working environment to new server.

Then once that is all working for a few days upgrade in place ont he new server.

I would also implement real SQL Server on the new box so you can back it up easily & properly just in case you need to roll back.

Mind you I am very conservative and avoid outages as much as I can at client sites.

Look up the RIM documentation on "Knife Edge Cutover" (or maybe Knife-Edge I forget)
Overview: You basically have to build the new box with the same exact BES version, detach your database, move it to the new box, attach it, perform the upgrade.