Problem - when I shut down an old Windows 2000 server that USED TO BE a
domain controller, though NEVER an Exchange server, Outlook 2003 becomes very
slow to open on every machine on the network.

Environment:
-single Exchange 2003, fully patched with all Microsoft updates / Outlook
2003, also fully patched with all available updates.
- Network of about 40 users
- NO RPC over HTTP
- NO cached Exchange mode
- NO .pst or .ost files permitted
- no IMAP or POP3 connections are permitted
- No ActiveSync connections are permitted
- single Exchange server, no front end/back end configuration.
- Currently, there are 2 domain controllers on the network, both functioning
without error (the Exchange server and another server).
- Domain is in mixed mode.
- No firewalls, Windows or otherwise, between desktops and Exchange.
- No related errors in event logs of servers or desktops
- No AD errors on domain controllers
- No DNS issues


Issue:
We have an old Windows 2000 server, that was the original domain
controller/file print server for the domain. About 3 years ago, we installed
a new Windows 2003 server and moved all of the AD rolls, DNS and DHCP off of
the old server and onto the new server. This server was NEVER an Exchange
server. We disabled DNS and DHCP serivces at that time and ran DCPromo to
remove the old server from the domain. All went well. There were no issues
or errors. Unfortunately, we left the old server up and running just in case
there was a file that someone needed. The old server was left running in the
rack and was forgotten about.

Now, we need to install some new servers and we need the rack space, so we
have to fully decommission the old server. Everything works fine when we
shut it down, EXCEPT for Outlook 2003. If the old server is shut down,
Outlook takes over 3 minutes to open on every desktop on the network. The
minute the server comes back up, Outlook opens normally.

We moved from Exchange 2000 to Exchange 2003 (fresh install on new server,
used Exmerge to move contents of mailboxes) about 2 years ago. The old
Exchange server has been off of the network since the upgrade.

If I open Outlook with the /rpcdiag switch with the old server down, the
first 2 connections are made immediately, with normal speed. The delay is
between the second and third connection.

The Outlook web client continues to function normally, whether or not the
old server is on.

I have tried all the safe mode switches. /safe:1, safe:3 and safe:4 do not
affect startup speed. If I start in /safe:2 (starts Outlook without checking
mail at startup), Outlook opens at normal speed. I have also tried the
/cleanprofile switch, which had no effect.

Other than the issue with Outlook, all logins/network applications and
resources function normally, whether the old server is up or not.

I searched through the registry of one of the desktops. I do not see any
references to the old server by either name or IP address.

I would appreciate any ideas on how to resolve this problem.