You must set Billing Rates before you can gather billing information and run a Billing Report.
You can configure billing for the following eight categories of billing rates:
Mailbox Access
Base Rates
Connect Time
Disk Usage
Messages Received
Fax Messages
Network Rates
Pager Calls
In the navigation tree, click Report Generation, then click Billing, and then click Billing Rates.
Configure rates for one or more of the billing categories in the Billing Rates form.
Click Save.