The only sure way to get ALL your BIS service books is to have them pushed from the back end – either by logging into your carrier’s BIS site, or by contacting your carrier’s Customer Support and having them push the service books down.

As for your BES service books, your BES Admin can push them down, or if you have Desktop Manager installed and configured with your host Email connected, your service books will automatically be pulled down when you connect. Note that if you do this, you should go to your Enterprise Activation screen and wait about 5 minutes to see if it starts. Sometimes it does, sometimes it doesn’t, but if it does start up, you’re best off keeping the connection until it finishes.