Originally Posted by dowlingm
be careful - depending on what level of 4.0 you're upgrading from you may have to go in stages rather than straight to 4.1.6.
I would concur with this. It might be best to get the latest 4.0.x version from RIM, upgrade your BES that version as an interim, then finally upgrade to 4.1.x. This is what RIM would probably suggest, and they have lots of experience.