This script will help you to create bulk mailbox. You can create 10 or 1000 mailbox, it is up to you, just fallow the simple steps and provide input after executing the script.
This script is great and handy if you are looking for populating users for your LAB etc..
Download the script from here
Step One execute the script from your Exchange server
Just provide the input for the script , that is all you have to do
Script will take your inputs it will create mailboxes, you can create 10 or 1000 mailbox with simple clicks..