Manage mailboxes , external contacts , mail users , resource mailboxes , and message, mailbox, and recipient limits .

If a Windows Live ID is already in use when you create a new mailbox, you'll have to import or evict it. Learn that and more about Windows Live ID management.

Quickly provision large numbers of new users at once using a CSV file in the Web management interface.

Use this Windows PowerShell script to bulk-provision new users, and bulk-update or bulk-delete existing users.

Use public groups to let lots of users easily exchange e-mail messages and dynamic distribution groups for groups whose membership changes frequently.

Administrators and help desk personnel can troubleshoot user problems by accessing the user's Options page .

Understand the password requirements and how to reset users' passwords.