I just went through on a situation when our customer's licences ran out simply because a migration from XP to Win7.
The problem is that in this case the endpoints got duplicated in the Console therefore a migrated endpoint took 2 licenes, so we got short of licences and could not protect migrated endpoints.
I suggest Webroot amend the online user guide with these interesting topics all admins should know and understand:
1- Moving endpoints to new subnet
2- Migration to new OS
3- Reinstallation of machines
All topics must explain what happens on the management console, in which cases endpoints will be duplicated and what is the suggested workaround in those cases.