This falls under the heading of "no good deed goes unpunished."
I started working for a small company that uses Exchange for internal e-mail - they use a separate POP3 account for internet mail. Internal (exchange) e-mail addresses are email@example.com; POP3 addresses are firstname.lastname@example.org. They upgraded from Exchange 5.5 to Exchange 2003 a while ago and moved all the mailbox stores (about 25 or so) over to the Exchange 2003 server. They left the AD connector between the 5.5 box and the 2003 box in place.
The person responsible for doing all this is long gone.
Someone in management asked if the Exchange 2003 box could be changed so that it could host 'company.com', and that everyone's exchange e-mail domain be changed from 'city.company.com' to 'company.com'.
I'm not an Exchange expert, but I am one of the more technically proficient staff members. I accidentally said I'd take a look before I knew what I was getting myself into. WHAT WAS I THINKING?!
Here's what I discovered -- the Exchange 5.5 box was an NT4 server acting as a BDC, they were running Active Directory in mixed mode; PDC was running Windows 2000. After they migrated the mailboxes to the Exchange 2003 box, they removed the NT4 box from the network, deleted the NT4 computer's account from Active Directory and set Active Directory to run in Windows 2000 mode.
They didn't remove Exchange 5.5 and they they never removed the AD connector between the Exchange 2003 and Exchange 5.5 system! Obviously, since the NT4 box isn't on the network, I can't even look at the properties of the AD connector any longer, let alone delete it. Since the Active Directory was changed to Windows 2000 mode, I can't reconnect the NT4 box to the domain. The Exchange 2003 server is running Windows Server 2003 R2 (if that makes a difference).
How do I get rid of the remnants of Exchange 5.5 in this scenario? Is it even possible?
Thanks in advance,