The product is licensed per user - that is, by the overall number of Microsoft Office 365 end-user mailboxes in all Office 365 Organizations that Veeam Backup for Microsoft Office 365 is to process. A user mailbox can be a personal mailbox, an Online Archive mailbox, or both – in any case, you will need one license file (for that user) to archive mailbox data. Backup of shared and resource mailboxes is supported; note that these types of mailboxes do not need to be licensed.
- If one organization added to the Veeam Backup for Office 365 scope comprises 200 mailboxes, and another one comprises 100 mailboxes you need to backup, then you will need 300 mailbox users to be licensed.
- If you have 200 user mailboxes, 5 shared mailboxes and 5 resource mailboxes, you will only need 200 user mailboxes to be licensed.
Veeam also counts managed mailboxes – that is, mailboxes with at least one restore point created in the past 31 days. If you do not archive a mailbox for 31 day, its license will be revoked can be applied to another mailbox.