[Samba] Adding/removing domain workstations

[Mark Foley]

I am running Samba4 version 4.2.12 as our office AD/DC. Two questions on domain member computers:

1) When I un-join a Windows 7 workstation from the domain (Start > Computer > Properties >
Advanced > Computer Name > Change > Member of: Workgroup), it does not remove that computer
from the list of domain computer.  I have to either use samba-tool or (Windows)RAS Users and
Computers. It this normal? A bug? If the latter, is it fixed in a more current release of Samba?

2) If I have a dual-boot (Windows/Ubuntu) computer and I want to be a domain member booted
either way, do I need different computer names for each boot mode? 

THX --Mark