So you try to create a new user in AD for Exchange and specified an email address, only to find that the address was taken.
Then you remember, oh, you gave that address for someone else.. but you forgot who.
So HOW to find that email address on where it is attached to.
1) Windows AD and Users [...]

The MAD Monitoring thread was unable to read its configuration from the DS, error ‘0×80041010′. In your Exchange application event log, you will see this every 5 minutes. The fix can be found here at Microsoft’s knowledge base. http://support.microsoft.com/kb/288590

So you are logged in as yourself, and need to access someone’s mailbox. Yes you can associated a mailbox with your account, or just open someones inbox, but when you want to do something as importing contacts, you cannot. Soo..
 If you are using Windows XP

Hold the shift key and right click on the outlook shortcut [...]

Create a new user in active directory with an exchange mailbox.
Logon to outlook with the newly created account.
Open Tools -> Options
Click the Calendar options
Click the Resource Scheduling
Only have the first 2 checkboxes selected, 1)Automatically accept meeting requests and process canellations. 2) Automatically decline conflicting meeting requests.
When a dialog box for set permissions for offline use [...]

This is known as a bricklevel backup. The tool we use for this is ExMerge which can be found here. Extract the file and copy it to %Program Files%\ExchSvr\bin folder of the exchange server. Ensure you have full mailbox permissions to the mailbox you would like to export. Run the exmerge.exe file. Choose the second [...]