Remove an Server out of Exchange 2007 Organization

Good Day

I need some help to remove a server which is not part of my organization anymore out of the organization. I have an Exchange 2007 server on Server 2003 R2 x64 (CONTOSO-JHB) as my Primary DC and Exchange 2010 server on Server 2008 R2 (COM-DC1) as an Additional DC and future PDC.

I am in the process of moving from Windows 2003 to 2007 and from Exchange 2007 to 2010, I havce installed a previous Windows 2008 R2 witrh Exchange 2007, but encountered compatibility issues with Exchange 2007 on 2008 R2, so now I have to remove the server which i have formatted due to unablt to uninstall. The server that I want to remove is called (JHB-DC).

[PS] D:\>Get-ExchangeServer

Name                         Site                           ServerRole    Edition           AdminDisplayVersion
----                             ----                            ----------         -------           -------------------
CONTOSO-JHB         ccc.contoso.com/...  Mailbox,...      Standard       Version 8.2 (Bui...
JHB-DC                                                       Provisio...      Standard...     Version 14.0 (Bu...
COM-DC1                  ccc.contoso.com/...  Mailbox,...      Standard...     Version 14.0 (Bu...