We are primarily using Backup for O365 to create a PST file for terminated users. We never delete the O365 account but we export a PST so the mailbox data is in an accessible format for management, if needed. Basically, I am running the Veeam O365 backup then immediately creating the PST via Explorer for Exchange. Once that is done I don't need to retain the mailbox in Veeam and it is just consuming space. I cannot for the life of me figure out how to delete mailboxes out of Veeam once I am finished with them. Is there a way to do that?
I do see some other use cases for mailboxes in O365, e.g. running daily backups when we know a user is leaving the company and likely to start cleaning up their mailbox. But the primary use will be for PST exports and not being able to delete a mailbox backup would be a bummer.