The timeline was IIRC 1. MS made recommendations to use .local 2. Apple networks started to use Bonjour and used .local, breaking on networks that used .local

The timeline was IIRC 1. MS made recommendations to use .local 2. Apple networks started to use Bonjour and used .local, breaking on networks that used .local already 3. RFC was submitted 4. MS recommended against using .local or any domain you do not own fully