To get your Billable Mailbox count, you take the Enabled Mailbox count and subtract the Shared Mailbox count.
EX: Sales Demo - 28 Enabled, 2 Shared = 26 Billable. \
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Keep in mind, we are invoicing based on high water mark usage during the previous month. This means if the protected mailbox count has dropped during the month, the number you get through this process may be a bit off.
\*Distribution Partners - Your billable mailbox count will be updated daily in your distribution marketplace!