Event ID 9554: Unable to update Mailbox SD in the DS

http://support.microsoft.com/kb/555433

http://support.microsoft.com/kb/322308

Exchange Server Remote Connectivity Analyzer

https://www.testexchangeconnectivity.com/

10 common issues you can fix with a registry hack

Useful post from TechRepublic:

http://blogs.techrepublic.com.com/10things/?p=855

How to verify basic IMAP connectivity by using Telnet

http://support.microsoft.com/kb/189326

VNC Server on Windows Vista

After installing VNC (Server) on a Vista machine in service mode, I was unable to connect to it on the local LAN via a wifi-connected Vista laptop. VNC Viewer would give me a "connection closed unexpectedly" error. Both machines had the Vista firewall disabled. The event viewer on the machine running VNC Server had the following entry:

Unable to connect session to Console: Access is denied.

The failure is due to security restrictions of Session 0 in Windows Vista. For more on Session 0 see here.

The workaround is to run VNC Server not as a service, but in User mode instead. You can add the shortcut of RealVNC User mode to your startup entries to ensure it starts for every boot.

Source (My Digital Life).

Your CD drive or DVD drive is missing or is not recognized by Windows or other programs

http://support.microsoft.com/KB/314060

Net Config Server Command

http://support.microsoft.com/kb/556004