Active connections on disabled 'Real Server'. (Exchange 2010)

We have a Virtual Service for all MAPI endpoint Outlook 2010 connections to our 3 x CAS Servers.  I want to perform some maintenance on CAS-2 so I have clicked Disable yet 3 days later (over weekend) I still see active connections on this server.  This is validated by running netstat -b | Findstr <VIP> on the CAS-2. I can see many instances of Outlook connections on the VIP.