So you have a new pc or a new Outlook profile. You login to your mailbox, all your data is there but your auto complete list which Outlook auto generates has gone, what a pain.
This is actually easy to get back and is basically just a file stored in your user profile on your pc.
Browse to :
C:\Documents and Settings\USERNAME\Application Data\Microsoft\Outlook
Look for a file called Outlook.NK2
The name might be different to that but will still have the same extension of .NK2
Copy or rename the file to it matches your Outlook profile name.

When trying to bring another DC online to active directory via DCPromo I kept getting an error message telling me to run forest and domainprep even though I had already done so.

Before you can introduce Windows Server 2003 domain controllers, you must prepare the forest and domains with the ADPrep utility.

ADPrep /forestprep on the schema master in your Windows 2000 forest.
 
ADPrep /domainprep on the Infrastructure Master in each AD domain.

So you've got your brand spanking new PDA or phone with push email thinking it will work nicely out of the box with exchange.....wrong!