We backup Office365 mailboxes and was wondering Commvault's behaviour on two scenarios (clients are able to restore messages themselves):
1. A user mailbox is backed up by Commvault. The user leaves the organization, his/her mailbox gets erased in Azure (not only disabled). The user comes back year(s) later and the same user mailbox is recreated in Azure by the admin.
1.a. Would Commvault consider this as the continuation of the before-existing mailbox and gives the user access to the previously archived messages or
1.b. Commvault uses a unique ID apart from the mailbox name to identify the user mailbox?
If 1.b, how can the user gain access to the previously backed up contents to do a restore him/herself?
2. A mailbox was disabled/deleted before the migration to Office365 from on-prem. We have the PST backups containing the on-prem user mailbox. When the user rejoins the organization, how can the mailbox contents be made accessible to the user for self-service restore?
Thank you in advance,