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 problem occured on a Office 2003 install with Livemeeting 2007 conferencing add-in pack for Outlook. When you schedule a livemeeting, and click send, you receive the error “An error occured while executing this command. If this error persists, please contact your livemeeting administrator.” 
First thing first, ensure the login test passes in the user accounts section. We all think uninstalls should do [...]

So you may have tried to find New Year’s day on your Outlook 2003 calendar for 2008, and there was nothing. Why? well you think to yourself, tools, options, calendar options, add holidays. But that adds it to 2007 only.
This is because Microsoft only offers holiday calendar updates for 3 years after the product version. [...]

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 [...]